PDF Actual Sample: GB 2626-2019
| Standard ID | GB 2626-2019 (GB2626-2019) |
| Description (Translated English) | Respiratory protection--Non-powered air-purifying particle respirator |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | C73 |
| Classification of International Standard | 13.340.30 |
| Word Count Estimation | 41,491 |
| Date of Issue | 2019-12-31 |
| Date of Implementation | 2020-07-01 |
| Older Standard (superseded by this standard) | GB 2626-2006 |
| Drafting Organization | Sinosteel Wuhan Safety and Environmental Protection Research Institute Co., Ltd., Academy of Military Science and Chemical Research Institute, 3M China Co., Ltd. |
| Administrative Organization | Ministry of Emergency Management of the People's Republic of China |
| Regulation (derived from) | National Standards Bulletin No. 17 of 2019 |
| Proposing organization | Ministry of Emergency Management of the People's Republic of China |
| Issuing agency(ies) | State Administration of Market Supervision and Administration, National Standardization Administration |
ENGLISH: GB 2626-2019 (Translated) GB 2626-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.30
C 73
Replacing GB 2626-2006
Respiratory protection - Non-powered air-purifying
particle respirator
呼吸防护 自吸过滤式防颗粒物呼吸器
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Classification and marking ... 11
4.1 Classification of facepiece ... 11
4.2 Classification of filter element ... 11
4.3 Grades of filter element ... 12
4.4 Marking ... 12
5 Technical requirements ... 12
5.1 Basic requirements ... 12
5.2 Visual inspection ... 13
5.3 Filter efficiency ... 14
5.4 Leakage ... 14
5.5 Breathing resistance ... 15
5.6 Exhalation valve ... 15
5.7 Dead space ... 16
5.8 View field ... 16
5.9 Head harness ... 16
5.10 Connections and connecting parts ... 17
5.11 Lens ... 17
5.12 Air tightness ... 17
5.13 Flammability ... 17
5.14 Cleaning and disinfection ... 18
5.15 Practical performance ... 18
5.16 Information to be provided by the manufacturer ... 18
5.17 Packaging ... 20
6 Testing methods ... 20
6.1 Visual inspection ... 20
6.2 Pretreatment ... 20
6.3 Filter efficiency ... 22
6.4 Leakage ... 26
6.5 Inhalation resistance ... 31
6.6 Exhalation resistance ... 34
6.7 Air tightness of exhalation valve ... 34
6.8 Protection device of exhalation valve ... 36
6.9 Dead space ... 36
6.10 View field ... 38
6.11 Head harness ... 38
6.12 Connections and connecting parts ... 39
6.13 Lens ... 40
6.14 Air tightness ... 40
6.15 Flammability ... 41
6.16 Practical performance ... 42
7 Product marking ... 43
7.1 Markings on the product ... 43
7.2 Marking on the packaging ... 43
Appendix A (Informative) Summary of testing requirements ... 45
Appendix B (Informative) CMD and MMAD conversion method ... 48
Appendix C (Normative) Method for judging whether KP filter element’s loading
filter efficiency continues to decrease ... 51
Appendix D (Normative) Main dimensions of test head mold ... 53
Appendix E (Informative) Main differences between this standard and the 2006
edition ... 54
References ... 57
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 2626-2006 "Respiratory protection equipment -
Non-powered air-purifying particle respirator".
Compared with GB 2626-2006, the main changes in this standard are as follows:
- CHANGE the standard name from "Respiratory protection equipment -
Non-powered air-purifying particle respirator" to "Respiratory protection -
Non-powered air-purifying particle respirator";
- DELETE three terms "smoke", "fog" and "microorganism"; ADD seven
terms "penetration", "user face-seal check", "assigned protection factor",
"count median diameter", "mass median diameter", "aerodynamic
diameter", "mass median aerodynamic diameter" (see 3.14 and 3.19 ~
3.24);
- MODIFY the requirements for inspiratory resistance and expiratory
resistance of various types of respirators (see 5.5);
- MODIFY the requirements and test methods for air tightness of exhalation
valves (see 5.6.1 and 6.7);
- MODIFY the name of the exhalation valve cover to an exhalation valve
protection device (see 5.6.2 and 6.8);
- MODIFY the vision requirements for various types of respirators (see 5.8);
- ADD the requirements and test methods for products that the manufacturer
claims filter elements can be reused after cleaning and / or disinfection [see
5.14.1, 5.16d), 6.2.3];
- ADD the practical performance requirements and testing methods (see 5.15
and 6.16);
- ADD a description of the method of judging the service life of filter elements
in the information part to be provided by the manufacturer; ADD the
application restrictions on non-flame-retardant products (see 5.16);
- In the testing method of filter efficiency, ADD the conversion method of
particle size used for testing of filter efficiency (see Appendix B),
requirements for accuracy and resolution of particle detector for the filter
efficiency testing equipment (see 6.3.2) and judgment of loading end point
(see 6.3.4.4, 6.3.4.5, 6.3.4.6, Appendix C); ADD the requirements for load
(see 6.3.3);
- In the testing method of leakage, ADD requirements for sample inspection
(see 6.4.1.4); ADD the accuracy requirements for particle detectors (see
6.4.2.4); ADD a formula for calculating the inward leakage by subject [see
formula (5)];
- ADD the schematic diagram of the structure of the built-in breathing hose
for the test head mold for breathing resistance testing and dead space
testing (see Figure 4);
- In the test method of breathing resistance, MODIFY the requirements for
the micromanometer parameters (see 6.5.2.3); ADD the requirements for
airtightness between the respirator facepiece and the test head mold (see
6.5.4 and 6.6.4);
- MODIFY the schematic diagram of the testing device for dead space (see
Figure 6);
- In the test method of head harness, ADD the requirement to apply the test
tensile force in the direction in which the head harness is stretched during
normal use (see 6.11.3).
Note: See Appendix E for the main differences between this standard and the
2006 edition.
This standard was proposed by and shall be under the jurisdiction of the
Ministry of Emergency Management of the People's Republic of China.
Drafting organizations of this standard: China Iron and Steel Group Wuhan
Safety and Environmental Protection Research Institute Co., Ltd., Academy of
Military Science and Chemical Research Institute, 3M China Co., Ltd.
The main drafters of this standard: Cheng Jun, Ding Songtao, Yang Xiaobing,
Yao Hong, Zhou Xiaoping, Cai Xialin, Zhang Shouxin, Yu Jingjing.
This standard was first issued in 1981, revised to GB/T 2626-1992 in 1992, then
revised to GB 2626-2006 in 2006.
Respiratory protection - Non-powered air-purifying
particle respirator
1 Scope
This standard specifies the classification and marking, technical requirements,
testing methods, identification of non-powered air-purifying particle respirator.
This standard applies to non-powered air-purifying respirator that protects
against particle.
This standard does not apply to respirators that protect against harmful gases
and vapors. It does not apply to the respirators for hypoxic environments,
underwater operations, escape, fire-fighting.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 2890-2009 Respiratory protection - Non-powered air-purifying
respirators
GB/T 5703 Basic human body measurements for technological design
GB/T 10586 Specifications for damp heat chambers
GB/T 10589 Specifications for low temperature test chambers
GB/T 11158 Specifications for high temperature test chambers
GB/T 18664-2002 Selection, use and maintenance of respiratory protective
equipment
GB/T 23465-2009 Respiratory protective equipment - Practical performance
evaluation methods
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Particle
Solid, liquid or particle mixed with solid and liquid suspended in air, such as
dust, smoke, mist and microorganisms.
[GB/T 18664-2002, definition 3.1.15]
3.2
Dust
The tiny solid particles suspended in the air, which are generally produced
by the solid materials being broken by mechanical forces.
[GB/T 18664-2002, definition 3.1.16]
3.3
Non-powered air-purifying respirator
Filtered respirator that relies on the wearer’s breathing to overcome the
airflow resistance of the component.
[GB/T 18664-2002, definition 3.1.3]
3.4
Tight-fitting facepiece
A facepiece that can cover the mouth and nose and fit tightly to the face, or
a facepiece that can cover the eyes, mouth, and nose and fit tightly to the
head and face.
Note 1: The close-fitting facepiece is divided into a half facepiece and a full
facepiece.
Note 2: Rewrite GB/T 18664-2002, definition 3.1.5.
3.5
Half facepiece
A tight-fitting facepiece that covers the mouth and nose, or covers the mouth,
nose, and jaw.
Note: Half facepieces are divided into disposable facepieces and
replaceable half facepieces.
3.6
Full facepiece
Tight-fitting facepiece that covers eyes, mouth, nose and jaw.
3.7
Disposable facepiece
A half facepiece mainly composed of a filter material, which can be provided
with an exhalation valve.
3.8
Replaceable facepiece
Closed half-facepieces and full facepieces with single or multiple
replaceable filter elements, which can be provided with breathing valves and
/ or breathing hose.
3.9
Inhalation valve
A one-way valve that only allows inhaled air to enter the facepiece and
prevents exhaled air from exiting the facepiece through it.
[GB 2890-2009, definition 3.6]
3.10
Exhalation valve
A one-way valve that only allows exhaled air to exit the facepiece and
prevents inhaled air from entering the facepiece through it.
[GB 2890-2009, definition 3.7]
3.11
Breathing hose
A flexible, air-tight air hose for connecting a facepiece to a filter element.
3.12
Filter element
Filter materials or filter components used in filtered respirators to filter out
harmful substances in the inhaled air.
Examples: canisters (filter cartridges), dust canisters, filter media, etc.
[GB/T 18664-2002, definition 3.1.22]
3.13
Filter efficiency
Under the specified testing conditions, the level of particle is filtered out by
the filter element.
3.14
Penetration
The level of particle penetrating the filter element under specified testing
conditions.
Note: Penetration = 100% - filter efficiency.
3.15
Total inward leakage; TIL
Under the specified laboratory test environment, the ratio of the
concentration of the simulant leaked into the facepiece from all the facepiece
components including the filter element when the subject inhaled to the
concentration of the simulant in the test environment outside the respirator
facepiece.
Total inward leakage = Ci / C0 × 100% ………………………… (1)
Where:
Ci - The concentration of the simulant in the respirator facepiece;
C0 - Concentration of the simulant in the test environment outside the
respirator facepiece.
3.16
Inward leakage; IL
Under the specified laboratory testing environment, the ratio of the
concentration of the simulant leaked into the facepiece from all other parts
of the facepiece except the filter element when the subject inhaled to the
concentration of the simulant in the test environment outside the respirator
facepiece.
Inward leakage = Ci/C0 × 100% ………………………… (2)
Where:
Ci - The concentration of the simulant in the respirator facepiece;
C0 - Concentration of the simulant in the test environment outside the
respirator facepiece.
3.17
Dead space
Volume fraction of carbon dioxide gas as re-inhaled from a previous
exhalation.
3.18
Head harness
A part for fixing the facepiece on the head.
3.19
User face-seal check
A simple tightness check method performed by the respirator wearer, to
ensure that the tight-fitting facepiece is worn correctly.
Note: Rewrite GB/T 18664-2002, definition 3.1.24.
3.20
Assigned protection factor
One type or category of respiratory protective equipment with suitable
functions, which is expected to reduce the concentration of air pollutants on
the premise that it is suitable for users to wear and use correctly.
Note: Rewrite GB/T 18664-2002, definition 3.1.29.
3.21
Count median diameter; CMD
When the particles are sorted according to the particle size, the particle size
at which the number of particles larger than the particle size and smaller than
the particle size each accounts for 50% of the total particle size.
3.22
Mass median diameter; MMD
When the particles are sorted according to the particle size, the particle size
at which the mass of particles larger than the particle size and smaller than
the particle size each accounts for 50% of the total particle mass.
3.23
Aerodynamic diameter
The diameter of a unit density spherical particle that has the same settling
velocity as the particle in question.
3.24
Mass median aerodynamic diameter, MMAD
When the particle is sorted according to the size of the aerodynamic particle
size, the particle size at which the mass of particles larger than the particle
size and smaller than the particle size each accounts for 50% of the total
particle mass.
4 Classification and marking
4.1 Classification of facepiece
According to the structure, the facepiece is divided into three types: disposable
facepiece, replaceable half facepiece, full facepiece.
4.2 Classification of filter element
Filter elements are divided into two categories: KN and KP. Category KN is only
suitable for filtering non-oily particles; category KP is suitable for filtering oily
and non-oily particles.
4.3 Grades of filter element
According to the level of filter efficiency, the grades of filter elements is classified
according to Table 1.
Table 1 -- Grades of filter element
Type of filter element Type of facepiece Disposable facepiece Replaceable half facepiece Full facepiece
Category KN
KN90
KN95
KN100
KN90
KN95
KN100
KN95
KN100
Category KP
KP90
KP95
KP100
KP90
KP95
KP100
KP95
KP100
4.4 Marking
The filter elements of disposable facepieces and replaceable facepieces shall
be marked with grades; the grades shall be marked with a combination of the
number of this standard and the type and grade of filter elements.
Example 1: The KN90 filter element is marked as GB 2626-2019 KN90.
Example 2: The KP100 filter element is marked as GB 2626-2019 KP100.
5 Technical requirements
5.1 Basic requirements
Check in accordance with 6.1 and evaluate in 6.16. The material and structural
design of the respirator shall meet the following requirements:
a) The material shall meet the following requirements:
1) Materials that are in direct contact with the face shall be harmless to
the skin;
2) The filter material shall be harmless to the human body;
3) The material used shall have sufficient strength; in normal use, it shall
not be damaged and deformed that affects the use effect;
4) No obvious tenderness or tingling sensation when wearing it.
b) The structural design shall meet the following requirements:
1) It shall not be easy to cause structural damage; the design, composition,
installation of components shall not pose any danger to the user;
2) The design of the head harness shall be elastic material or adjustable,
for easy wearing and removal. It shall be able to firmly fit the facepiece
on the face; there shall be no obvious compression or tenderness when
wearing. The head harness of replaceable half facepiece and full
facepiece shall be designed to be replaceable;
3) If the facepieces of the same size and the same style have different
wearing methods, they shall be tested as different products;
Note 1: Different wearing methods of the same style facepiece will affect the
tightness of the facepiece.
4) It shall not significantly affect the visual field;
5) When wearing, the lenses of the full facepiece shall not affect the vision,
such as fogging;
6) Respirators which use replaceable filter elements, inhalation valves,
exhalation valves, head harness shall be designed for easy
replacement; meanwhile it allows the wearer to check the airtightness
of the facepiece and face at any time and conveniently, to make user
face-seal check;
Note 2: See Appendix G of GB/T 18664-2002 for user face-seal check method.
7) The breathing hose shall not restrict the movement of the head or the
wearer; it shall not affect the tightness of the facepiece; it shall not
restrict or block the airflow;
8) The front side of the exhalation valve shall be protected. The exhalation
valve protection device can be a dedicated component, or it can be
protected by other components on the facepiece;
9) The structure of the disposable facepiece shall ensure close fit with the
face; meanwhile it shall not deform during normal use;
10) The parts of the replaceable facepiece (except the filter element) shall
be washable.
5.2 Visual inspection
Check it in accordance with 6.1.
The surface of the sample shall neither be damaged, deformed, nor have other
obvious defects. The material and structure of the component shall be able to
withstand normal use conditions and the temperature, humidity and mechanical
shock that may be encountered. After the temperature and humidity
pretreatment and mechanical strength pretreatment according to the method of
6.2, the components shall not fall off, be damaged or deformed. The inspection
shall also include markings and various information as provided by the
manufacturer.
5.3 Filter efficiency
Use sodium chloride (NaCl) particles to test the KN filter elements. Use dioctyl
phthalate (DOP) or oil particles (such as paraffin oil) of equivalent nature to test
the KP filter elements.
Perform testing in accordance with the method of 6.3.
In the testing process, the filter efficiency of each sample shall always meet the
requirements of Table 2.
Table 2 -- Filter efficiency
5.4 Leakage
5.4.1 TIL for disposable facepieces
Perform test in accordance with the method of 6.4. The TIL of disposable
facepieces shall meet the requirements of Table 3.
Table 3 -- TIL of disposable facepieces
Grade of filter
material
When using the TIL of each action (i.e. 10 people
x 5 actions) as the basis for evaluation, the TIL of
at least 46 of the 50 actions
When using the overall TIL as the basis for
evaluation, the overall TIL of at least 8
persons of the 10 persons under test
KN90 or KP90 < 13% < 10%
KN95 or KP95 < 11% < 8%
KN100 or KP100 < 5% < 2%
Not
applicable
Not
applicable
Category and grade of filter element Tested by sodium chloride particle Tested by oily particle
5.4.2 IL of replaceable half facepiece
Perform test in accordance with the method of 6.4. When using the IL of each
action (i.e. 10 people x 5 actions) as the basis for evaluation, the IL of at least
46 of the 50 shall be less than 5%. When using the overall IL of person as the
basis for evaluation, the overall IL of at least 8 persons of the 10 persons under
test shall be less than 2%.
5.4.3 IL of full facepiece
Perform test in accordance with the method of 6.4. When the IL of each action
is used as the basis for evaluation (i.e. 10 persons x 5 actions), the IL of each
action shall be less than 0.05%.
5.5 Breathing resistance
Perform test in accordance with the method of 6.5 and 6.6.
The inhalation resistance and exhalation resistance of all types of respirators
shall meet the requirements of Table 4.
Table 4 -- Requirements for breathing resistance
Type of facepiece
Inhalation resistance / Pa Exhalation
resistance / Pa KN90 and KP90 KN95 and KP95 KN100 and KP100
Disposable facepiece, without
exhalation valve ≤ 170 ≤ 210 ≤ 250
Same as inhalation
resistance
Disposable facepiece, with exhalation
valve ≤ 210 ≤ 250 ≤ 300
≤ 150
Replaceable half facepiece and full
facepiece including filter element ≤ 250 ≤ 300 ≤ 350
5.6 Exhalation valve
5.6.1 Air tightness of exhalation valve
Detects only half facepieces. The exhalation valve shall meet the following
requirements:
When tested according to the method of 6.7, the leakage flow rate of the
exhalation valve of each respirator shall not be greater than 30 mL/min; if the
facepiece is provided with multiple exhalation valves, the leakage airflow that
each exhalation valve shall meet shall be shared equally, for example, if the
respirator facepiece is provided with 2 exhalation valves, the leakage air flow of
each exhalation valve shall not be greater than 15 mL/min.
5.6.2 Protection device of exhalation valve
Perform test in accordance with the method of 6.8.
The exhalation valve’s protection device shall not slip, break and deform when
it is subjected to the axial tensile force as specified in Table 5.
Table 5 -- Axial tensile force that the exhalation valve’s protection device
shall withstand
Type of facepiece Disposable facepiece Replaceable facepiece
Tensile force 10 N for 10 s 50 N for 10 s
5.7 Dead space
Perform test in accordance with the method of 6.9.
The average dead space result of the respirator shall not be greater than 1%.
5.8 View field
Perform test in accordance with the method of 6.10.
The view field of the respirator shall meet the requirements of Table 6.
Table 6 -- View field
View field
Type of facepiece
Half facepiece Full facepiece Big view window Double view window
Below view field ≥ 35° ≥ 35° ≥ 35°
Overall view field Not applicable ≥ 70% ≥ 65%
Double-eye view field ≥ 65% ≥ 55% ≥ 24%
5.9 Head harness
Perform test in accordance with the method of 6.11.
Each head harness, buckle and other adjustment parts of the respirator shall
not slip or break when it is subjected to the tensile force as specified in Table 7.
Table 7 -- Tensile force that the head harness shall withstand
Type of facepiece Disposable facepiece Replaceable half facepiece Full facepiece
Tensile force 10 N for 10 s 50 N for 10 s 150 N for 10 s
5.10 Connections and connecting parts
Perform test in accordance with the method of 6.12.
Under the specified test conditions, all connections and connection parts
between the replaceable filter element and the facepiece, and between the
breathing hose and the filter element and the facepiece, shall not slip, break or
deform when subjected to the axial tensile force as specified in Table 8.
Table 8 -- Axial tensile forces that the connection and connecting parts
shall withstand
Type of facepiece Replaceable half facepiece Full facepiece
Tensile force 50 N for 10 s 250 N for 10 s
5.11 Lens
5.11.1 Only full facepieces are tested.
5.11.2 Perform test in accordance with the method of 6.13. The lens of each
sample shall not be broken or cracked. Then test the airtightness in accordance
with the method of 6.14, which shall meet the requirements of 5.12.
5.11.3 Perform test in accordance with the method of 6.16. The lens shall not
cause distortion of the visual object.
5.11.4 If a product is added with ant-dimming paste, or an anti-fogging agent is
designed to be used, the anti-fogging agent shall not use known harmful
substances; after using the ant-dimming paste and / or anti-fogging agent, it
shall not cause vision deformation or blurring; anti-fog agents shall not cause
irritation and other discomfort to humans. They are tested in accordance with
methods 6.1 and 6.16.
5.12 Air tightness
Perform test in accordance with the method of 6.14.
Under the specified testing conditions, the pressure change in each full
facepiece within 60 s shall not be greater than 100 Pa.
5.13 Flammability
5.13.1 If the product design is non-flammable, it shall provide the information in
accordance with the requirements of 5.16c) 1).
5.13.2 If the product is designed to be flame-retardant, it shall be tested in
accordance with the method of 6.15. After the parts exposed to the flame are
removed from the flame, the continuous burning time shall not exceed 5 s.
5.14 Cleaning and disinfection
5.14.1 If the product design allows the filter element to be reused after cleaning
and / or disinfection, it shall meet the requirements of 5.16d); meanwhile the
filter element shall be able to withstand the cleaning or disinfection treatment
as recommended by the manufacturer. The cleaned or disinfected sample shall
meet the requirements of 5.3 for filter efficiency, 5.4 for leakage, 5.5 for
inhalation resistance. The manufacturer shall provide the user with the correct
and effective method for determining whether the filter element will continue to
be effective after cleaning or disinfection.
5.14.2 For replaceable facepieces, the facepieces shall be able to withstand
the cleaning or disinfection treatment as recommended by the manufacturer;
the samples after cleaning or disinfection shall meet the requirements of 5.4.
5.15 Practical performance
Perform test in accordance with the method of 6.16. Under the conditions of
simulated use, the performance which is hard to be evaluated by the use of
other testing methods, such as the performance specified in 5.1b) and 5.11, the
subject will provide subjective evaluation.
If the respirator fails the test, the laboratory shall describe the test method in
detail, so that other laboratories can repeat the test process.
5.16 Information to be provided by the manufacturer
Perform inspection in accordance with the method of 6.1.
The correctness of the information provided by the manufacturer shall be
judged in accordance with the relevant provisions of GB/T 18664-2002.
The information provided by the manufacturer shall meet the following
requirements:
a) It shall be provided with the smallest sales package.
b) There shall be instructions in Chinese.
c) It shall include the following information that the user must know:
1) Application scope and restrictions, which shall include (but not limited
to) the applicable particle category (such as whether it contains oil), the
assigned protection factor of the respirator, and / or other unsuitable
application environments; if the product design is not flame-retardant,
there shall be text description that "this product is not suitable for
working places with open flames (such as welding, casting, etc.)";
2) For replaceable filter elements, explain how to use them with full
facepieces or half facepieces. If multiple filter materials are used, they
shall be indicated;
3) Assembly method of replaceable facepiece;
4) Inspection method before use;
5) How to wear and how to do air tightness check;
6) How to judge the service life of disposable facepieces;
7) For replaceable facepieces, provide advice on when to replace the
facepiece or filter element;
8) If applicable, maintenance methods (e.g. cleaning and disinfection
methods);
9) Storage method;
10) Meaning of any symbols and icons used.
d) If the product claims that the filter elements can be reused after cleaning
and / or disinfection, it shall provide the following information:
1) The specific characteristics and / or scope of the applicable particle;
2) The maximum number of times it can be cleaned and / or disinfected;
3) Method to determine whether the filter element will continue to be
effective and when to replace it after cleaning and disinfection.
e) Provide warnings about problems that may be encountered during use,
such as:
1) Fitness to the face of the wearer;
2) The hair under the seal frame will cause the facepiece to leak;
3) Air quality (pollutants, hypoxia, etc.).
f) The information shall be clear; it may add the help explanations such as
commentary, part number and labeling.
5.17 Packaging
Perform inspection in accordance with the method of 6.1.
Sales packaging shall protect the product from mechanical damage and
contamination before use.
6 Testing methods
6.1 Visual inspection
According to the requirements of various technical requirements (see Appendix
A), before performing laboratory performance testing, the samples shall be
visually inspected.
6.2 Pretreatment
6.2.1 Temperature and humidity pretreatment
6.2.1.1 Number of samples and requirements
2 un-conditioned samples; or quantities required by other testing methods.
6.2.1.2 Testing equipment
The testing equipment shall meet the following requirements:
a) The technical performance of the high temperature test chamber shall
meet the requirements of GB/T 11158;
b) The technical performance of the low temperature test chamber shall meet
the requirements of GB/T 10589;
c) The technical performance of the damp heat test chamber shall meet the
requirements of GB/T 10586.
6.2.1.3 Testing methods
Remove the samples from the original packaging and process them in the
following order:
a) Place it at (38 ± 2.5) °C and (85 ± 5)% relative humidity for (24 ± 1) h;
b) Place it in a dry environment at (70 ± 3) °C for (24 ± 1) h;
c) Store it at (-30 ± 3) °C for (24 ± 1) h.
The pretreatment method used shall avoid thermal shock; allow the sample
temperature to return to room temperature for at least 4 hours before
subsequent pretreatment or testing.
6.2.2 Mechanical strength pretreatment
6.2.2.1 Number of samples and requirements
It is only applicable to replaceable filter elements. 2 untreated samples; or
quantities required by other testing methods.
6.2.2.2 Testing equipment
The vibration test device is as shown in Figure 1. The device consists of a steel
box, a steel platform, a cam, a drive, a control system on which the sample is
placed; the steel box is fixed on a support that can be moved vertically. The
steel box is lifted by 20 mm through the rotation of the cam. Then let it fall on a
steel platform by its own weight, to generate a vibration. The mass of the steel
box shall be greater than 10 kg. The mass of the steel platform shall be at least
10 times the mass of the steel box. The cam’s rotation frequency is (100 ± 5)
r/min.
6.2.2.3 Test methods
Take the sample out of the package. The non-encapsulated filter element shall
be the smallest sales package.
Place the sample laterally in the steel box; the placement method shall ensure
that the samples will not contact each other during the test. It allows for 6 mm
horizontal movement interval and free vertical movement distance.
The duration of vibration testing is 20 min.
After the test is over, perform the follow-up tests.
In millimeters
Explanation:
1 - Steel box; 2 - Steel platform; 3 - Piston; 4 - Rotation cam.
Figure 1 -- Schematic diagram of vibration test device
6.2.3 Pretreatment for cleaning and / or disinfection
6.2.3.1 Sample quantity and requirements
It is only applicable to products designed and claimed to have filter elements
that can be cleaned and / or disinfected. Use the quantity required by other
testing methods.
6.2.3.2 Testing methods
The samples shall be pretreated according to the cleaning and / or disinfection
methods as recommended in the product description, as well as the maximum
number of reuses allowed after cleaning and / or disinfection. After each
cleaning and / or disinfection, it shall ensure that the sample is completely dry;
then judge whether the cleaned or disinfected sample continues to be valid
according to the method provided by the manufacturer; record the results; then
start the next cleaning and / or disinfection pretreatment...
6.3 Filter efficiency
6.3.1 Sample quantity and requirements
20 samples of disposable facepieces. If the products have different size
numbers, there shall be at least 5 samples for each number. 20 samples of
replaceable filter elements; it shall include filter cotton and the receiving seat
part (if applicable) which accommodates the filter cotton, wherein 5 of them are
samples after pretreatment in 6.2.1, whilst the other 5 are samples after
pretreatment in 6.2.2 (if applicable). For products that meet the requirements of
5.14.1, it shall have at least 5 samples that after pretreatment in 6.2.3, the rest
is the untreated samples. The pretreated sample shall be placed in an air-tight
container and tested within 10 hours.
6.3.2 Testing equipment
6.3.2.1 NaCl particle filter efficiency testing system
The main technical parameters are as follows:
a) The concentration of NaCl particles does not exceed 200 mg/m3, the count
median diameter (CMD) is (0.075 ± 0.020) μm; the geometric standard
deviation of the particle size distribution is not greater than 1.86;
Note: Using the conversion method provided in Appendix B, the mass median
aerodynamic diameter (MMAD) as converted from the count median diameter
is about 0.3 μm.
b) The dynamic range of the particle detector is 0.001 mg/m3 ~ 200 mg/m3;
the accuracy is 1% or 0.001 mg/m3;
c) The testing flow range is 30 L/min ~ 100 L/min; the accuracy is 2%;
d) The testing range of filter efficiency is 0 ~ 99.999%; the resolution shall be
at least 0.003%;
e) There shall be a device capable of neutralizing the charge of the particles
that has occurred.
6.3.2.2 Testing system for filtering efficiency of oily particles
The main technical parameters are as follows:
a) The concentration of DOP or other applicable oily (such as paraffin oil)
particles is 50 mg/m3 ~ 200 mg/m3; the count median diameter (CMD) is
(0.185 ± 0.020) μm; the geometric standard deviation of the particle size
distribution is not greater than 1.60;
Note 1: Using the conversion method provided in Appendix B, the mass median
aerodynamic diameter (MMAD) as converted from the count median diameter
is about 0.3 μm.
Note 2: Applicable substitutes for DOP are confirmed oily substances whose test
results are comparable to DOP.
b) The dynamic range of the particle detector is 0.001 mg/m3 ~ 200 mg/m3;
the accuracy is 1% or 0.001 mg/m3;
c) The testing flow’s range is 30 L/min ~ 100 L/min; the accuracy is 2%;
d) The filtering efficiency’s testing range is 0 ~ 99.999%; the resolution is at
least 0.003%.
6.3.2.3 Testing conditions
The testing temperature of KN type filter element is (25 ± 5) °C; the relative
humidity is (30 ± 10)%; the concentration of NaCl particles shall not exceed 200
mg/m3.
The testing temperature condition of KP type filter element is (25 ± 5) °C; the
concentration of oily particles shall not exceed 200 mg/m3.
The testing flow rate is (85 ± 4) L/min. If it is a multiple filter element, the flow
rate shall be divided equally; for example, for a dual filter element design, the
testing flow rate of each filter element shall be (42.5 ± 2) L/min. If multiple filter
elements are likely to be used alone, they shall be tested according to the
testing conditions of a single filter element.
6.3.3 Load requirements
6.3.3.1 When testing the filtering efficiency of filter elements, it shall
continuously load the particle on the filter elements. The cumulative loading of
each respirator filter element is based on (200 ± 5) mg of particle as the basic
requirement. If the respirator uses multiple filter elements, the load shall be
divided equally. For example, for dual filter elements, the particle load on each
filter element shall be (100 ± 5) mg. For the design of three filter elements, the
particle load on each filter element is (66.7 ± 5) mg. If multiple filter elements
are possible to be used alone, the load shall be the same as the single filter
element.
6.3.3.2 For KP type filter elements, if the conditions as described in 6.3.4.6
where it needs extending the load to continue testing the filter efficiency when
the loading reaches to the basic requirements, the maximum loading of each
respirator shall be 2 times the basic loading as specified in 6.3.3.1, that is (400
± 5) mg. If the respirator uses multiple filter elements, the loading shall be
divided equally; the maximum loading on each filter element shall be 2 times
the corresponding basic load as specified in 6.3.3.1.
6.3.4 Testing method
6.3.4.1 First adjust the filter efficiency testing system to the testing state; adjust
the relevant test parameters.
6.3.4.2 Use appropriate fixture to connect the filter element to the testing device
in an air-tight manner. The filter element shall include the socket for the filter
material and a gasket (if applicable). If the filter element cannot be separated
from the facepiece (such as disposable facepiece), the exhalation valve on the
facepiece shall be completely sealed.
6.3.4.3 After the test is started, it shall continuously record the filter efficiency
results. When the filter efficiency has fallen below the limit of the filter efficiency
of this grade of products, it shall stop testing immediately and judge the product
to be nonconforming.
6.3.4.4 For KN type filter elements, during the loading process, if the filter
efficiency is lower than the filter efficiency limit of the product of this grade, it
shall stop testing. When reaching to the basic loading as specified in 6.3.3.1, if
the filter efficiency has not been lower than the filter efficiency limit of this grade
of product, it shall judge the product as qualified.
6.3.4.5 For KN type filter elements, only when following the requirements of
6.3.4.4 to grasp the regular change trend in the filtering efficiency of the product
with the increase in loading through testing, the trend will show that there is a
minimum point of filter efficiency, meanwhile the filter efficiency after this
minimum point will continue to increase with the increase of the loading; then
in the subsequent testing of other samples, it allows that before the loading
reaches to the basic loading as specified in 6.3.3.1, when the filter efficiency
curve appears the expected minimum value, this minimum value is not lower
than the filter efficiency limit of this grade of product, meanwhile the filter
efficiency in the subsequent loading process afterwards also shows an
increasing trend, it allows to stop testing and judge this product as qualified.
6.3.4.6 For KP type filter elements, if the amount of accumulated particle on the
filter material has reached the basic loading as specified in 6.3.3.1 and the filter
efficiency has decreased, it shall continue loading. Before the loading reaches
the maximum loading as specified in 6.3.3.2, if the filter efficiency is lower than
the limit of the filter efficiency of this grade of product, it shall stop the testing
immediately; otherwise it shall continue loading. When it is determined
according to the method provided in Appendix C that the fluctuation bandwidth
is not greater than the fluctuation bandwidth limit (BL) in Table 9, it can be
judged that the curve stops falling, at this time the data is the minimum value of
filter efficiency, it may stop testing. If the minimum value is not lower than the
filter efficiency limit of the product of this grade, it shall be judged that the
product is qualified. When the loading reaches the maximum loading as
specified in 6.3.3.2, as long as the filter efficiency is not less than the filter
efficiency limit of the product of this grade, it shall also judge the product as
qualified.
Table 9 -- Fluctuation bandwidth limits (BL) of KP type filter elements of
different grades
Fluctuation bandwidth limit used to judge whether
the loading filter efficiency continues drop
Grade of KP type filter element
KP90 KP95 KP100
BL 0.20% 0.10% 0.004%
6.3.4.7 It shall report the minimum filter efficiency of each filter element.
6.4 Leakage
6.4.1 Sample quantity and requirements
6.4.1.1 Ten samples of disposable facepieces, wherein 5 of them are untreated
samples and the other 5 are samples after pretreatment in 6.2.1. If the product
claims to meet the requirements of 5.14.1, wherein 5 of them are samples as
pretreated in 6.2.1 and the other 5 are samples not pretreated in 6.2.3. Then all
samples are treated according to 6.4.1.4 (if applicable). If the products have
different size numbers, each number shall have at least two samples.
6.4.1.2 Two samples of replaceable facepieces, wherein 1 of them is an
untreated sample and the other is a sample as pretreated in 6.2.1. If the product
claims to meet the requirements of 5.14.1, one of them is the sample as
pretreated in 6.2.1 and the other is the sample as pretreated in 6.2.3. If the
products have different size numbers, there shall be two samples for each
number, wherein 1 of them is an untreated sample or the sample as pretreated
in 6.2.3 (if applicable) and the other is the sample as pretreated in 6.2.1. Then
all samples are treated in accordance with 6.4.1.4.
6.4.1.3 Where there is a breathing hose, the breathing hose shall be tested as
an integral part of the facepiece.
6.4.1.4 According to the product’s instruction manual, if the respirator facepiece
is provided with parts for routine filter element replacement, facepiece cleaning
or maintenance, which shall be frequently removed or replaced by the wearer
(such as inhalation valve, exhalation valve, or replaceable filter element, etc.),
before performing the leakage testing, the trained and experienced personnel
shall disassemble such components on the sample and then assemble them
again according to the operating methods as provided in the product’s
instruction manual; then make it subject to testing by the subject.
6.4.2 Testing equipment
6.4.2.1 The schematic diagram of the testing system is as shown in Figure 2.
6.4.2.2 The inspection chamber has a closable chamber with a large
observation window, the size of which allows the subject to complete the
prescribed actions. It shall be so designed that the simulation agent is to be
uniformly fed in from the top of the chamber and discharged from the exhaust
port at the lower part of the chamber.
6.4.2.3 The simulant generating device shall meet one of the following
requirements:
a) The generated gas volume of NaCl particles is not less than 100 L/min;
the concentration of particles is 4 mg/m3 ~ 12 mg/m3; the concentration
change in the effective space of the testing chamber shall not be higher
than 10%; the aerodynamic particle size distribution of the particles shall
be 0.02 μm ~ 2 μm; the mass median diameter is about 0.6 μm.
b) Oil particles shall be harmless to the human body, such as corn oil, paraffin
oil, etc.; the generated gas volume shall not be less than 100 L/min; the
particle concentration shall be 20 mg/m3 ~ 30 mg/m3; the concentration
change in the effective space of the testing chamber shall not be higher
10%; the aerodynamic particle size distribution of the particles shall be
0.02 μm ~ 2 μm; the mass median diameter is about 0.3 μm. This method
shall not be used for TIL testing of disposable facepieces with KN-type
filter elements.
6.4.2.4 The dynamic range of the particle tester is 0.001 mg/m3 ~ 200 mg/m3;
the accuracy is 1% or 0.001 mg/m3; the response time of the tester shall not be
greater than 500 ms.
6.4.2.5 Sampling pump: The adjustment range is 0.50 L/min ~ 4 L/min.
Explanation:
1 - Aerosol generator; 2 - Airway and deflector; 3 - Testing chamber; 4 - Exhaust port;
5 - Sample from the sampling tube of testing chamber; 6 - Sampling tube for tested
sample; 7 - Air pump; 8 - Replenished fresh air; 9 - Particle tester.
Figure 2 -- Schematic diagram of the testing system of total inward
leakage and inward leakage
6.4.3 Testing conditions
6.4.3.1 Before testing, the sample shall be checked and confirmed complete in
accordance with the method of 6.1; meanwhile there is no danger to the subject.
6.4.3.2 Personnel familiar with the use of such products shall be selected for
testing. Select 10 beard-shaving subjects whose face shapes shall be
representative users of this type of product, considering the differences in face
shape and gender, but shall not include those with significantly abnormal face
shapes. According to the requirements of GB/T 5703, measure and record the
morphological face length and face width data of the subject (accurate to mm).
6.4.3.3 The sampling flow rate of particle shall be controlled to 1 L/min ~ 2 L/min.
6.4.3.4 The sampling position of particle in the test chamber shall be located in
the active area of the subject's head; the sampling position of particle in the
tested sample shall be located as far as possible at the centerline of the
subject's mouth; the sampling tube shall be air-tightly connected to the tested
sample.
6.4.3.5 The subjects first read the usage method of the tested samples. If the
tested samples have different size numbers, they shall choose the most
appropriate number for the subjects as required. The subject shall also
understand the testing requirements and methods.
6.4.3.6 When testing the leakage of replaceable half facepieces and full
facepieces, it shall use the filter element of at least KP100 and equivalent
resistance instead of the original filter element of the facepiece.
6.4.4 Testing method
Prepare the sample to be tested and install the sampling tube. The mounting
position of the sampling tube shall be as close to the right front side of the user's
mouth and nose as possible. For disposable facepieces, it shall take necessary
measures to prevent the sampling tube from affecting the position of the
facepiece during the test. When applicable, connect KP100 grade filter
elements. Check the testing system to confirm that it is in normal working
condition.
Lead the particle into the testing chamber to make the concentration reach the
requirements.
The subject wears the test sample in the clean air area; checks the airtightness
according to the usage method; then connects the sampling tube to the particle
tester. Measure the background concentration in the facepiece when the
subject is breathing outside the testing chamber. Make 5 measurements. Take
the arithmetic mean as the background concentration.
Have the subject enter the testing chamber and connect the sampling tube to
the particle tester while avoiding particle contamination. Then the subject
completes the following actions in order according to time requirements:
a) The head is still and not talking, 2 min;
b) Turn the head to the left and right to see the left and right walls of the
testing chamber (about 15 times), 2 min;
c) Look up and down to check the roof and ground (about 15 times), 2 min;
d) Read a text aloud (such as counting numbers), or speak aloud, 2 min;
e) The head is still and not talking, 2 min.
During each action, it shall test the particle concentration in the testing chamber
and the facepiece at the same time. Generally, it only tests the last 100 s time
interval of this action; avoids the cross section of the testing action. For each
action, it shall test 5 data. Calculate the arithmetic mean as the result of the
action.
Subjects are allowed to adjust the facepiece they are wearing during the test,
but the action shall be repeated.
After the replaceable facepiece is used, it shall be treated according to the
manufacturer's recommended cleaning or disinfection method before being
used for the test of next subject.
When using NaCl particle testing, the total inward leakage of each action when
testing the disposable facepiece and the inward leakage of each action when
testing the replaceable facepiece are calculated according to formula (3):
Where:
C - The concentration of particle in the tested facepiece during each action,
in milligram per cubic meter (mg/m3);
Ca - The background concentration of particle in the tested facepiece, in
milligram per cubic meter (mg/m3);
C0 - The concentration of particle in the testing chamber when doing each
action, in milligram per cubic meter (mg/m3);
1.7 - Correction factor, correction for the decrease in particle concentration
in the respirator facepiece caused by the inhalation of sodium chloride by
the subject's respiratory tract.
When using oil particle for testing, the total inward leakage of each action when
testing the disposable facepiece and the inward leakage of each action when
testing the replaceable facepiece are calculated according to formula (4):
Where:
C - The concentration of particle in the tested facepiece during each action,
in milligram per cubic meter (mg/m3);
Ca - The background concentration of particle in the tested facepiece, in
milligram per cubic meter (mg/m3);
C0 - The concentration of particle in the testing chamber when doing each
action, in milligram per cubic meter (mg/m3);
The overall total inward leakage or overall inward leakage of each subject as
Total inward leakage by action (inward leakage by action)
Total inward leakage by action (inward leakage by action)
calculated by person is calculated according to formula (5):
Overall total inward leakage by person (Overall inward leakage by person) = 1/5 Σ
Total inward leakage by action (inward leakage by action) ... (5)
6.4.5 Testing report
The testing report shall report the following:
a) The arithmetic mean of the testing results of inward leakage or total inward
leakage for each test subject for each test action;
b) Calculation result of the overall inward leakage or overall total inward
leakage for each test subject.
6.5 Inhalation resistance
6.5.1 Sample quantity and requirements
4 samples, wherein 2 of them are untreated samples and the other 2 are
samples as pretreated in 6.2.1. For products that meet the requirements of
5.14.1, 2 are samples as pretreated in 6.2.3 and the other 2 are samples as
pretreated in 6.2.1. If the products have different size numbers, there shall be
two samples for each number, wherein 1 of them is an untreated sample or
sample as pretreated in 6.2.3 (if applicable), the other is the sample as
pretreated in 6.2.1.
6.5.2 Testing equipment
6.5.2.1 The schematic diagram of the inhalation resistance testing device is as
shown in Figure 3.
6.5.2.2 The range of the flow meter is 0 L/min ~ 100 L/min; the accuracy is 3%.
6.5.2.3 The micro-pressure has a measurement range of -1000 Pa ~ 1000 Pa;
the accuracy is 1%; the resolution is at least 1 Pa.
6.5.2.4 Test head mold: Breathing hose is installed at the mouth of the test head
mold, as shown in Figure 4. The main dimensions of the head mold shall meet
the requirements of Appendix D. It is divided into three size types: large,
medium, small.
6.5.3 Testing conditions
6.5.3.1 If applicable, the sample to be tested shall include replaceable filter
elements and breathing hoses.
6.5.3.2 The ventilation volume is (85 ± 1) L/min.
6.5.4 Testing methods
Check the air tightness and working status of the testing device. Adjust the
ventilation volume to (85 ± 1) L/min. Set the system resistance of the testing
device to 0.
It shall take appropriate measures (such as the use of sealants), to air-tightly
wear the test sample on a matching test head mold. It shall ensure the correct
wearing position of the facepiece. The fixing method shall neither affect the
effective ventilation area of the filter element, nor deform the facepiece. Adjust
the ventilation volume to (85 ± 1) L/min. Determine and record the maximum
inhalation resistance.
Explanation:
1 - Tested sample; 2 - Breathing duct of test head mold; 3 - Sampling port accessory
installed on the test head mold for testing the pressure inside the facepiece; 4 -
Pressure measuring tube; 5 - Micromanometer; 6 - Flow meter; 7 - Regulating valve;
8 - Switching valve; 9 - Suction pump (for testing of inhalation resistance); 10 - Air
compressor (for testing of exhalation resistance).
Figure 3 -- Schematic diagram of testing device for exhalation resistance
and inhalation resistance
In millimeters
Explanation:
1 - Test head mold; 2 - Built-in breathing hose for test head mold; 3 - The accessory
used when testing the breathing resistance, which is a sampling port for pressure
testing in the facepiece; 4 - Exhalation inlet connected to the ventilator when testing
dead space; 5 - Inhalation outlet connected to the ventilator when testing dead space;
6 - Interface connected to the micromanometer when testing the breathing resistance,
or the interface connected to the carbon dioxide gas analyzer when testing the dead
space (inhalation phase); 7 - Exhalation; 8 - Inhalation.
Figure 4 -- Schematic diagram of the built-in breathing hose of the test
head mold used for testing of breathing resistance and dead space
6.6 Exhalation resistance
6.6.1 Sample quantity and requirements
4 samples, wherein 2 of them are untreated samples and the other 2 are
samples as pretreated in 6.2.1. If the products have different size numbers,
there shall be two samples for each number, wherein 1 of them is an untreated
sample and the other is a sample as pretreated in 6.2.1.
6.6.2 Testing equipment
6.6.2.1 The schematic diagram of the testing device for exhalation resistance
is as shown in Figure 3.
6.6.2.2 The flowmeter is the same as 6.5.2.2.
6.6.2.3 Micromanometer is the same as 6.5.2.3.
6.6.2.4 The test head mold is the same as 6.5.2.4.
6.6.3 Testing conditions
Same as 6.5.3.
6.6.4 Testing method
Check the air tightness and working status of the testing device. Adjust the
ventilation volume to (85 ± 1) L/min. Set the system resistance of the testing
device to 0.
It shall take appropriate measures (such as the use of sealants), to air-tightly
wear the test sample on a matching test head mold. It shall ensure the correct
wearing position of the facepiece. The fixing method shall neither affect the
effective ventilation area of the filter element, nor deform the facepiece. Adjust
the ventilation volume to (85 ± 1) L/min. Determine and record the maximum
exhalation resistance.
6.7 Air tightness of exhalation valve
6.7.1 Sample quantity and requirements
Samples of 4 respirators, wherein 2 of the respirators are untreated samples
and the other 2 are samples as pretreated in 6.2.1.
6.7.2 Testing conditions
6.7.2.1 At normal temperature and pressure, the relative humidity shall be less
than 75%.
6.7.2.2 The sample to be tested shall include the facepiece part as connected
to the exhalation valve. The exhalation valve shall be kept clean and dry. For
the sample of the disposable facepiece’s exhalation valve, it shall take
necessary measures, to prevent the valve of the sample from being
contaminated by the facepiece debris in the preparation process (such as
cutting it off from the facepiece).
6.7.3 Testing equipment
The schematic diagram of the testing device for the exhalation valve’s air
tightness is as shown in Figure 5. The testing equipment shall meet the
following requirements:
a) Vacuum pumping rate is about 2 L/min.
b) The capacity of the buffer container is at least 5 L.
c) The micro-pressure measurement range is -1000 Pa ~ 0 Pa; the accuracy
is 1%; the resolution is at least 1 Pa.
d) The range of the flow meter is 0 mL/min ~ 100 mL/min; the accuracy is
1%; the resolution is at least 0.1 mL/min.
Explanation:
1 - Vacuum pump; 2 - Regulating valve; 3 - Buffer container; 4 - Micromanometer; 5 -
Test fixture of exhalation valve; 6 - Flow meter.
Figure 5 -- Schematic diagram of the testing device for air tightness of
exhalation valve
6.7.4 Testing methods
Check the test system and the seal of the exhalation valve’s fixture, to ensure
air tightness.
Take an appropriate method (such as using a sealant), to seal the exhalation
valve sample on the exhalation valve’s test fixture in an air-tight manner; turn
on the vacuum pump; adjust the regulating valve, to make the exhalation valve
be subject to a pressure of -249 Pa, to test the leakage air flow of exhalation
valve.
6.8 Protection device of exhalation valve
6.8.1 Sample quantity and requirements
3 untreated respirator samples.
6.8.2 Testing equipment
6.8.2.1 The measuring range of the material testing machine is 0 N ~ 1000 N;
the accuracy is 1%. Or otherwise use the standard weight suspension method;
it may apply a tensile force in accordance with Table 5.
6.8.2.2 The fixture has a proper structure and clamping degree.
6.8.2.3 The accuracy of the timer is 0.1 s.
6.8.3 Testing methods
Use appropriate clamps to respectively fix the exhalation valve’s protection
device and the facepiece of the tested sample (the fixing point shall be
reasonably close to the corresponding connection site). Start the material
testing machine or suspend the standard weight, to apply the axial tensile force
as specified in Table 5. Record whether there are fractures, slippage,
deformation.
6.9 Dead space
6.9.1 Sample quantity and requirements
Disposable facepiece, which are 3 untreated samples. Half facepiece or full
facepiece, which is 1 untreated sample, or 1 untreated sample per number (if
applicable).
6.9.2 Testing equipment
6.9.2.1 The schematic diagram of the testing device for the dead space (inhaled
CO2 content) is as shown in Figure 6. Except for the breathing simulator, the
total volume of the gas path of the testing device shall not be greater than 2000
mL.
Explanation:
1 - Breathing simulator; 2 - Auxiliary pump; 3 - Check valve; 4 - Flow meter; 5 -
Compensation bag; 6 - Carbon dioxide gas analyzer; 7 - Solenoid valve; 8 - Test head
mold; 9 - Inhaled gas sampling tube; 10 - Carbon dioxide absorber; 11 - Carbon dioxide;
12 - Fan.
Figure 6 -- Schematic diagram of testing device for dead space
6.9.2.2 The test head mold is the same as 6.5.2.4.
6.9.2.3 The simulated breathing frequency of the breathing simulator is
adjusted to 20 times/min; the adjustment range of simulated breathing tidal
volume is 0.5 L/min ~ 3.0 L/min.
6.9.2.4 The volume fraction of carbon dioxide (CO2) gas source CO2 is (5.0 ±
0.1) %.
6.9.2.5 The range of the CO2 flowmeter is not less than 40 L/min; the accuracy
is 1 L/min.
6.9.2.6 The range of CO2 analysis instrument is not less than 12% (volume
fraction); the accuracy is not less than 0.1% (volume fraction).
6.9.2.7 Anemometer, electric fan and other equipment.
6.9.3 Testing conditions
6.9.3.1 Testing shall be carried out at room temperature; room temperature’s
range is 16 °C ~ 32 °C.
6.9.3.2 The breathing frequency and tidal volume of the breathing simulator
shall be set to 20 times/min and 1.5 L, respectively.
6.9.3.3 Adopt proper ventilation measures so that the concentration of CO2 in
the test environment is not higher than 0.1% (volume fraction). The testing point
of the CO2 concentration in the environment shall be located approximately 1
m directly in front of the tested sample.
6.9.3.4 Only when testing disposable facepiece samples, an electric fan is
required to blow air on the side of the tested sample, meanwhile the velocity of
the air flow in front of the facepiece shall be 0.5 m/s.
6.9.4 Testing method
Check the testing system to confirm that it is in normal working condition. Take
necessary measures, to air-tightly wear the tested sample on a matching test
head mold and prevent deformation of the facepiece.
Turn on the testing device for dead space, to continuously monitor and record
the concentration of CO2 in the inhaled gas and the testing environment, until it
reaches a stable value.
The three samples of disposable facepieces shall be tested once for each; the
half facepiece or full facepiece shall be tested repeatedly three times for each.
The test is valid only when the CO2 concentration in the test environment is not
greater than 0.1% (volume fraction); meanwhile the CO2 concentration in the
test environment shall be deducted. For the testing result of the CO2
concentration in the inhaled air, take the arithmetic mean of 3 measurements.
6.10 View field
Perform testing according to the method specified in 6.8 of GB 2890-2009.
6.11 Head harness
6.11.1 Sample quantity and requirements
Two samples, wherein 1 of them is an untreated sample and the other is a
sample as pretreated in 6.2.1.
6.11.2 Testing equipment
6.11.2.1 The measuring range of the material testing machine is 0 N ~ 1000 N;
the accuracy is 1%. Or otherwise select the standard weight suspension
method, which may apply the tensile force in accordance with the requirements
of Table 7.
6.11.2.2 Fixtures have proper structure and clamping degree.
6.11.2.3 The accuracy of the timer is 0.1 s.
6.11.3 Testing method
Use the fixture to fix the head harness (non-free end) of the tested sample and
the facepiece, respectively (it shall be reasonably close to the corresponding
head harness buckle’s connection part). Start the material testing machine or
suspend the standard weight, to apply the tensile force as specified in Table 7
according to the direction in which the head harness is stretched in normal use.
Record whether there are cracks and slippage.
It shall check the connection of each head harness of the tested sample and
record the results.
6.12 Connections and connecting parts
6.12.1 Sample quantity and requirements
2 samples, wherein 1 of them is an untreated sample and the other is a sample
as pretreated in 6.2.1.
6.12.2 Testing equipment
6.12.2.1 The measuring range of the material testing machine is 0 N ~ 1000 N;
the accuracy is 1%; or select the standard weight suspension method, which
may apply the tensile force in accordance with the requirements of Table 8.
6.12.2.2 Fixtures have appropriate structure and clamping degree.
6.12.2.3 The accuracy of the timer is 0.1 s.
6.12.3 Testing method
Use appropriate clamps to fix the connection parts of the tested sample and the
facepiece cover (the fixing points shall be reasonably close to the
corresponding connection parts). Start the material testing machine or suspend
the standard weight, to apply the axial tensile force as specified in Table 8.
Record whether there are fractures, slippage, deformation.
It shall respectively test each connection and connecting part of the tested
sample. Record the results.
6.13 Lens
6.13.1 Sample quantity and requirements
5 untreated samples.
6.13.2 Testing equipment
6.13.2.1 Test head mold: The main dimensions shall meet the requirements of
Appendix C. They are divided into three sizes: large, medium, small.
6.13.2.2 The diameter of the steel ball is 22 mm, the mass is (45 ± 1) g, the
surface shall be smooth.
6.13.3 Testing method
The test sample is correctly worn on a matching test head mold; the head mold
is placed and fixed with the lens upward. The steel ball is allowed to fall freely
from the height of 1.3 m to the center of the lens; record whether there is crack.
It shall respectively test each lens of the tested sample. Record the result.
6.14 Air tightness
6.14.1 Sample quantity and requirements
All untreated samples, or quantities required by other testing methods.
6.14.2 Testing equipment
6.14.2.1 The test head mold is the same as 6.5.2.4.
6.14.2.2 The micromanometer’s measurement range is 0 Pa ~ 2000 Pa; the
accuracy is 1%; the resolution is at least 1 Pa.
6.14.2.3 The accuracy of the timer is 0.1 s.
6.14.2.4 The pumping speed of the vacuum pump is about 2 L/min.
6.14.3 Testing methods
Wear the facepiece on the matching test head mold; seal the inhalation valve;
wet the exhalation valve. Start the vacuum pump, to make the pressure in the
facepiece reach -1000 Pa; stop pumping; start timekeeping; observe and record
the pressure change in facepiece within 60 s.
6.15 Flammability
6.15.1 Sample quantity and requirements
There are 4 disposable facepieces, 2 of which are untreated samples and the......