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GBT38413-2019

Chinese Standard: 'GBT38413-2019'
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GB/T 38413-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 56.080.30
W 04
Textiles - Test methods for filtration of particulate
matter
纺织品 细颗粒物过滤性能试验方法
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Principle ... 5 
5 Test equipment ... 5 
6 Materials and reagents ... 8 
7 Sample ... 8 
8 Test conditions ... 10 
9 Test procedure ... 10 
10 Test data processing ... 13 
11 Test report ... 14 
References ... 15 
Textiles - Test methods for filtration of particulate
matter
1 Scope
This Standard specifies the test method for determining the filtration of
particulate matter of textiles.
This Standard applies to products such as fabrics for air filtration and masks.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 6529, Textiles - Standard atmospheres for conditioning and testing
GB/T 6682, Water for analytical laboratory use - Specification and test
methods
GB/T 8629-2017, Textiles - Domestic washing and drying procedures for
textile testing
GB/T 10586, Specification for damp heat testing chambers
GB/T 10589, Specifications for low temperature test chambers
GB/T 11158, Specifications for high temperature test chambers
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Particulate matter
PM2.5
Particulate matter whose aerodynamic equivalent diameter is less than or equal
to 2.5 μm in ambient air.
3.2 Filtration efficiency
It shall be able to generate non-oily particles and oily particles that meet the
test requirements; it shall be able to neutralize the charge of the generated
particles, and ensure that the particles are evenly distributed at the sampling
port before filtration.
5.1.2.2 Non-oily particles
Sodium chloride (NaCl) particles. The count median diameter (CMD) of the
particle is 0.075 μm ± 0.020 μm; the geometric standard deviation of the particle
size distribution is not greater than 1.86.
The concentration of non-oily particles is set according to the product use
environment. The concentration of general industrial products is not more than
200 mg/m3; the concentration of civil products is not more than 30 mg/m3.
According to product needs, other test concentrations can also be set.
5.1.2.3 Oily particles
Diisooctyl sebacate (DEHS), dioctyl phthalate (DOP) or other applicable oils
(such as paraffin oil) particles. The count median diameter (CMD) of the particle
is 0.185 μm ± 0.020 μm; the geometric standard deviation of the particle size
distribution is not greater than 1.60.
The concentration of oily particles is set according to the product use
environment. The concentration of general industrial products is 50 mg/m3 ~
200 mg/m3; the concentration of civil products is not more than 30 mg/m3.
According to product needs, other test concentrations can also be set.
5.1.3 Test system
5.1.3.1 General requirements
It shall include sample fixtures, photometers, pressure gauges and flow meters;
the sampling frequency is ≥ 1 times/min; the detection range of filtration
efficiency is 0% ~ 99.999%; the resolution is at least 0.003%.
5.1.3.2 Sample fixture
It shall be made of corrosion-resistant metal materials and composed of upper
and lower holders. The fixture shall ensure that the sample has a circular
measured area of 100 cm2 ± 1 cm2, unless otherwise specified. There shall be
no leakage at the edge of the sample after clamping; the used sealing ring shall
not change the measured area of the sample. The surface of the fixture that is
in contact with the test aerosol shall be clean, easy to clean, corrosion-resistant,
conductive and grounded.
5.1.3.3 Photometer
7.2 Temperature and humidity pretreatment
7.2.1 Equipment
The sample temperature and humidity pretreatment equipment requirements
are as follows:
a) The technical performance of the damp heat testing chamber shall meet
the requirements of GB/T 10586;
b) The technical performan......
Related standard:   GB/T 38419-2019  GB/T 38473-2020
   
 
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