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GB/T 20654-2006

Chinese Standard: 'GB/T 20654-2006'
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GB/T 20654-2006English239 Add to Cart Days<=3 Protective clothing. Mechanical properties. Test method for the determination of the resistance to puncture and dynamic tearing of materials Valid GB/T 20654-2006
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BASIC DATA
Standard ID GB/T 20654-2006 (GB/T20654-2006)
Description (Translated English) Protective clothing. Mechanical properties. Test method for the determination of the resistance to puncture and dynamic tearing of materials
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard C73
Classification of International Standard 13.340.10
Word Count Estimation 19,186
Date of Issue 2006-12-07
Date of Implementation 2007-07-01
Adopted Standard ISO 13995-2000, IDT
Drafting Organization People's Liberation Army General Logistics Department Quartermaster Equipment Institute
Administrative Organization National Technical Committee of Standardization for Personal Protective equipment
Regulation (derived from) National Standard Approval Announcement 2006 No.11 (Total No.98)
Proposing organization State Administration of Work Safety
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard specifies the protective clothing materials resistant to puncture and dynamic tearing of test methods. This pierce and tear or damage due to clothing apparel integrity is destroyed and harm the wearer. When the risk of accidents and injuries associated with piercing degree tear, you can determine the performance levels specified materials to be used.

GB/T 20654-2006
Protective clothing.Mechanical properties.Test method for the determination of the resistance to puncture and dynamic tearing of materials
ICS 13.340.10
C 73
National Standards of People's Republic of China
GB/T 20654-2006/ISO 13995..2000
Protective clothing mechanical properties
Test method for puncture resistance and dynamic tear of materials
Protective clothing-Mechanical properties-Test method for the determination of
the resistance to puncture and dynamic tearing of materials
(ISO 13995..2000 JDT)
2006-12-07 Released.2007-07-01 Implementation
Chinese people llfl issue t = 4
Protective clothing mechanical properties
Test method for puncture resistance and dynamic tear of materials
1 Scope
The wood standard specifies test methods for puncture resistance and dynamic tear resistance of protective clothing materials. This puncture and tear can damage clothing or
The integrity of the outfit is compromised and the wearer is harmed. When the risk of accidental injury is related to the extent of puncture and tear
The performance level dictates the materials to be used.
2 terms and definitions
Column F terms and definitions apply to wood standards.
2.1
Test specimen mounting block
A metal or plastic holder that holds the specimen during the test.
2.2
Tearing blade
A blunt-tipped blade protruding from the blade set to pierce and tear the specimen.
Note. The lower edge of the end of the hard steel tearing blade is a wedge with a certain arc, so it is not sharp enough to pierce the test material. Blade body thickness
Bu's surface is a semicircle, which is used to tear the specimen. The blade has the same function as the spike in ASTM D 2582.1990, but it is more rigid,
Therefore, it can withstand greater forces.
3 mm,
3 Requirements for the use of this standard
This standard specifies the test method for puncture resistance and dynamic tear resistance of materials. If cited as a standard test method for a product,
It shall contain the necessary information for the application of this standard to this product. Standards referencing this standard should at least include the following.
a) Normative references to this standard.
b) Sample description. sample source, sample size, sample preparation and pretreatment (if any).
c) additional details or differences from the methods described in this standard.
-Special clamping and stretching methods of the sample;
Impact energy and velocity used in the test;
Positioning relative to the specified axis impact of the sample;
-Number of trials;
-Special techniques for measuring the tear length of specific materials or materials with specific applications.
d) Other contents to be provided in the test report.
-Product performance requirements and corresponding "levels". Performance requirements shall adopt the performance levels defined in this standard or
When testing under certain conditions, the average tear length is greater than a certain value, and the maximum value is not greater than a certain value ".
-A range of products that meet the requirements.
Appendix A provides information and guidelines for using this standard in product standards.
4 Test equipment and test process
4.1 Principle of puncture and dynamic tear test
The fabric or leather sample is firmly clamped on the fixed frame, and the sample body is kept hanging down. The upper part of the shelf is a quarter circle for easy sample
Leaning against it, there is a curved surface facing the tearing blade that drops onto the specimen, and a weight is attached to the tearing blade. The tip of the tear blade is sharp,
Can penetrate the curved part of the sample. The sleek lower part of the blade can tear down the overnight part of the sample.
energy. There is a groove on the vertical surface of the fixed frame, so that the end of the blade is on the fixed frame and the middle of the blade can be torn.
For very strong materials, the length of the tear produced by the sharp blade tip during puncture is less than 5 mm. And for weak
Material, this effect is small. Selecting the end point or selecting a qualified value of 40 mm can ensure that the main property of the measurement is the dynamic tear resistance of the material
Cracking. The tear length refers to the vertical dimension of the cut U produced by the blade. If tearing could harm the wearer,
Specimen specifies a smaller tear length, see Appendix A for details.
4.2 Types of tearing and measurement
There are usually the following types of tears.
Vertical tearing. tearing of the blade through the horizontal fiber of the sample;
b) V-Tear. A type that tears from the piercing point in the direction of the two branches. For woven fabrics, the warp between the branch and the fabric is 90 °,
The fiber is at an angle to the two 90 ° branches; for leather, composites and unsupported plastics, the branch is torn
30 ° between the roads;
Horizontal tear. A tear that extends from the puncture point to the direction in which the specimen is not strong. Coated knitwear sometimes happens in one direction
This tear. When a specimen of this material is cut, and this tear occurs at 90 ° to this direction, a strip usually occurs.
Very long tearing incisions overnight;
d) Complex tear. This tear combines the various characteristics of the tear described above. Some warp knitted fabrics will tear,
The road is vertical and the other is 45 °, or one is vertical and the other horizontal.
For all tear types, the tear length is the vertical dimension of the cut made by the blade on the specimen. If K tears enough
Long enough to keep the tear blade in place to measure the incision size. This will ensure that the V-torn specimens are rolled up consistently.
It can also ensure that each blade group produces a consistent tensile effect on the sample. If the tear length is less than the height of the blade, raise the blade
Piece, and keep the specimen clamped, and measure the incision. For materials that have abnormal response and are particularly weak in one direction, the prepared specimens should be
Withstands "worst case" tears and measures.
The final position of the blade set cannot reliably characterize the tear length of all materials, because a highly elastic fabric will stretch during the test, and its
The upper edge of the cut U will taut down. If only the position of the blade group when first contacting the specimen is compared with the final position of the blade group, then cut U
The size will be overestimated. In the pliable material, the blade group stays still after tearing will make the tear length of M to be too large.
4.3 Performance level
Use the following requirements to determine the level of performance the material will achieve. If the tear lengths in all directions of the specimen are close, then the grade of the material
Depends on the average tear length; if the tear length in the longest direction exceeds the tear length in the direction of the minimum tear length
50%, then the grade of the material depends on the average tear length in the worst direction.
4.4 Test device
The test device shall include a rigid heavy base on which the sample holder and the blade guide system are mounted, as shown in Figure 1. The guidance system should
Contains two vertical polished steel rods with a diameter of at least 15 mm and a center-to-center spacing of (100 ± 2) mm. Steel rod length should be able to guarantee 750
The falling stroke is the height between the lower edge of the blade group and the puncture point of the sample. A drop control device such as an electromagnetic device should be fixed in the initial position.
Fixed blade set. This height should be adjustable so as to compensate for the energy loss caused by friction and obtain a suitable impact energy. Measuring blade should be provided
Method of group impact rate.
4.5 Blade set
The proportion and size of the blade group are shown in Figure 2. The following four sets of blades with different halo should be provided.
(250 ± 10) g
(500 ± 10) g
(1 000 ± 20) g
(2 000 40) g
a)
c)
number 1
number 2
number 3
No 4
Appendix A
(Informative appendix)
Introduction to materials and apparel piercing and dynamic tear tests
A.1 Introduction
The test methods of this standard can be used to evaluate personal protective equipment (PPE). woven, knitted, coated, laminated, laminated or leather materials
The material is resistant to puncture and dynamic tearing.
This test method provides information on the relative puncture and dynamic tear resistance of a material in the event of an accidental puncture. In this situation,
The PPE may be punctured by a pushpin or obstacle and then tear. Weak clothing may produce large cuts, while sturdy clothing is
After the puncture, it will continue to tear, so the damage is suppressed, and the invasion of water, dust or chemicals is prevented. Trial provided after piercing
Information on the possibility of a tear.
A.2 Scope
The information provided in this appendix can help users using this standard to solve specific problems. The results obtained using this test method are also given.
Information on results and an explanation of the meaning of performance levels.
A.3 Use of this standard
When this standard is referenced, several parameters specified must be listed in accordance with Chapter 4. Consideration should also be given to additional or alternate test methods.
Data provided. This standard was drafted with the assumption that this is the most commonly used PPE standard.
A.4 Identification of injuries-selection of test methods
Which test method is used for PPE depends on the harm it will face. Six common types of puncture/tearing injuries have been identified.
The specific test methods available will be provided.
A.4.1 Piercing and ductile tear
PPE contacts at a small angle with sharp spikes, thumbtacks, thorns, needles, sharp metal edges, rough surfaces, and barbed wire
Causes piercing and tearing. Use of this standard can determine the material's ability to resist such damage
A.4.2 Piercing
The PPE directly touches a pointed spike, thumbtack, thorn, or a point on the needle with a certain force, and it will be pierced. It's a pure thorn
Wear, can be tested in accordance with EN 863..1995 "Test method for mechanical properties of protective clothing. puncture resistance".
A.4.3 Impact cutting and puncture
PPE can produce a cut when a certain force is directly applied to the sharp points and blades of sharp knives, broken glass, thin metal wires, etc.
Hit cutting. The resistance of clothing materials to impact cutting can be according to EN 1082-3..2000, Protective clothing against dagger-cut and stabbed hands
Sleeves and guards-Part 3. Impact cutting tests on fabrics, leather and other materials.
A.4.4 Sliding cut
PPE is cut by sharp edges when it comes in contact with sheet metal, chips, knives, glass, castings, and cutting tools. According to EN ISO 13997..1999
"Determining the Cutting Resistance of Sharp Objects with Protective Clothing Mechanical Properties".
A.4.5 Impact wear
During the fall of skaters, climbers, and motorcycle riders, concrete, rocks, and certain heights on the road surface
The sharp point will impact the clothing material with a large force M, causing rapid wear and loss of the material. This loss of material can cause
Piercing and subsequent tearing. Material abrasion resistance according to ASTM STP1237 "Woven leather and fabric braided belts for motorcycle riders
"Tester impact wear test" method to evaluate. The method of this standard can be used to evaluate the tear resistance of cattle due to wear and tear.
A.4.6 Shear, puncture and tear
If a blunt head or cylinder such as the spikes of a football sole hits other players obliquely, it will directly cause injury. BS EN 13061..2002
"Knee-protection requirements and test methods for football players in protective clothing" stipulates this special and severe piercing and tearing.
A.4.7 Tearing or bursting
There are many established tear tests for woven and leather, but not for highly woven or knitted materials. These tests are performed in
Perform at low speed. Coatings and knitted materials often use burst tests. Although the burst test cannot check the properties of the material after the hole is created
Yes, but it provides a method to compare the tensile strength of all materials, and the detection of woven and leather is as satisfactory as knitted materials.
A.4.8 Summary of test method selection
A.4.8.1 Suitable for selection of puncture and dynamic tear tests
The puncture and dynamic tear tests of this standard are very suitable in the following cases.
a) when both puncture and dynamic tear injuries occur;
b) when the risk analysis shows that the consequences of the extension of the tear caused by the puncture are severe;
c) When the relative movement between the nail and the PPE during the injury process exceeds lm/s;
d) When the material is highly flexible, it is actually pulled but not torn;
e) when the material is a knitted, mesh or non-woven fabric that is difficult to measure using traditional tear test methods;
f) When woven, knitted or non-woven fabric coating can significantly improve the puncture and tear resistance of the material
g) when the material is an unsupported film;
h) when materials that can only be tested by this method are compared with materials that can also be tested by other methods;
0 When product standards need to consider materials between c) ~ g) and other unrestricted materials
A.4.8.2 Not suitable for selective puncture and dynamic tear tests
Piercing and dynamic tear tests are not suitable in the following cases.
a) When the injury is mainly one of A.4.2 ~ A.4.6;
b) if incisions or tears in the material are extremely dangerous, resistance to initial puncture or cutting is critical;
) When tear resistance is far greater than puncture resistance and the integrity of the protective layer is important.
A.5 Risk analysis
If this standard is cited, a risk analysis must be performed as follows.
A.5.1 Identifying threats and quantifying
Threats to the integrity of PPE mainly come from objects that cause piercing and those that cause tearing or piercing when moving relative to PPE,
This threat has the following characteristics.
a) the sharpness of the piercing object;
b) The sharpness of the tearing edge (if the tearing edge is sharp enough to cut PPE, the puncture and dynamic tear tests are not applicable)
c) the relative speed between the object and the body part covered by PPE and PPE, and the impact energy;
d) the energy required to suspend the relative motion between the object and the PPE (this can be achieved by suppressing the object or suppressing the PPE,
(The latter method may suppress the user's activity or only the PPE when the PPE is movable on the user);
c) The user's response to the impact, such as the reflection control when the hand is slipped when the wrench is used strongly
f) the frequency of threats.
If existing experience cannot determine how strong a material should be when resisting a particular threat, the forces in a potential event need to be measured and the
It is linked to the capability standard. For example, based on measurements and calculated values, it can be estimated that the force between the nail and the upper may exceed 800 N, while the hand
The force between the sleeve and other objects in the glove box may be less than 20 N.
A.5.2 Estimate of potential harm
If the strength of the PPE is less than the specified value, the level of mechanical properties that the PPE should have depends on the potential damage. If puncture resistance and movement
State tearing is not enough, the following types of injuries may occur.
a) Potentially fatal injuries to cattle immediately, such as when the inflatable buoyant rescue device or life jacket is torn;
b) Immediate and obvious or delayed but implied serious injury, such as when PPE comes into contact with harmful substances, and protective materials have
When cutting the UI, this kind of damage will occur to the user, and this kind of damage will occur in anti-nuclear, biochemical, spray and gloves
c) Likely injury, such as when clothing is used to protect occasional contact with the above substances,
This injury occurs when in contact with hazardous substances, and this injury can accumulate, such as pesticides penetrating the incision and accumulating in the spray clothing;
d) Immediate and obvious injuries of varying degrees, which occur when a physical injury injures a PPE wearer through a cut
This kind of injury may be caused by spikes piercing the waste bag and hitting the worker ’s leg, or local objects tearing boots to help sting the wearer
Occurs on feet or ankles;
c) delayed but implied injury, which occurs when a PPE is compromised and reduces the effectiveness of the protection;
f) Moderate to severe potential injury, when the outer layer of the protective clothing cuts the UI, it will directly cause the injury, for example. the outer layer of the fire protection clothing
Cutting U can directly cause burns or burns due to water ingress, or it can also occur when the dipping suit is torn into the water;
Minor to severe injuries, which can occur when a PPE incision reduces immediate effectiveness, such as in severe weather
This type of injury can be caused by tearing of the used warm clothing or waterproof weather protection clothing;
h) Potential injury, which will lose its effectiveness when the clothing is torn, for example, high visibility clothing will become ineffective and visible after being torn
The range is reduced.
A.5.3 Risk level assessment
The overall level of risk depends on the severity of the threat, the frequency of occurrence, the level of potential harm, and the extent to which the hazardous substance or situation occurs
rate. The following points should be considered.
a) the frequency of exposure to mechanical injuries;
b) the severity of the mechanical injury;
c) the frequency of exposure of PPE to harmful substances or places when there is a crack;
d) The severity of the injury that may be caused by the substance or location.
The level of risk is related to the type of cropping, the training level of the cropping person, and the amount of exposure to the environment with puncture damage. Fireman and accident department
Management personnel are often in places with low visibility and limited space, where the risk of puncture is high. In some cases, damage to PPE
A threat, while other conditions may cause only minor injuries or discomfort.
Laboratory personnel in the biochemical and nuclear industries should minimize the risk of being punctured by protrusions because exposure to this environment is extremely
May be seriously injured or even fatal. Due to the effects of exposure to some biochemical substances, it takes some time to show up,
Therefore, the immediate harm may not be obvious in different environments. In addition, the damage may not be limited to the contact person, but may be caused by genetic
Inherited to the next generation.
The level of risk varies with the significance of the tearing of the PPE and the possibility of direct remedial action. So reduce
The PPE risk level can be passed through frequent inspections or used in the nuclear industry. The PPECPPE protective layer that will alarm after being punctured will be worn towards
Alarm signal). If untrained workers ignore small tears, chemicals can penetrate and line the garment's interior and interior.
Layers to accumulate, thus increasing the risk level. In this case, the more sturdy the PPE risk rating is, the higher the sturdy
The longer the PPE is used, the more contaminants accumulate through the small tear openings.
g)
A.6 Performance standards
Standard setting personnel who refer to this standard should clearly state their performance standards in the product standard based on the risk analysis. Some marks
A standard base tear length may be as long as 40 mm, while other standards require 10 mm or less. Some standards will require impact energy to
Means the average impact on the type of protective clothing used, while other standards require energy that exceeds
Foreseeable impact.
A.7 Performance level description
For most types of PPE, the following four performance levels provide appropriate grading. The levels mentioned in Table A.1, their basis
The basis is the maximum tear length of 40 mm, and when the blade group M doubles, the tear length also roughly doubles. Therefore, this data can also be used as
There is a basis for performance standards with different maximum tear lengths. When drafting product standards, the performance of representative materials should be determined.
Related standard:   GB/T 20655-2006  GB/T 38144.1-2019
Related PDF sample:   GB 5725-2009  GB 811-2010
   
 
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