GB/T 38413-2019 English PDF (GB/T38413-2019)

GB/T 38413-2019: Textiles - Test methods for filtration of particulate matter
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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
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 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;
7.2.2 Method
Take the sample out of the original packaging and proceed as follows:
a) Place it in an environment at 38.0 °C ± 2.5 °C, where the relative humidity
is (85 ± 5) %, for 24 h ± 1 h;
b) Place it in a dry environment at 70 °C ± 3 °C for 24 h ± 1 h;
c) Place it in an environment at -30 °C ± 3 °C for 24 h ± 1 h.
Before proceeding to the above-mentioned b) and c) treatment steps, the
sample temperature shall be restored to room temperature for at least 4 h
before proceeding to the subsequent steps. After the step c), the sample shall
be placed in an airtight container and tested within 10 h.
7.3 Washing pretreatment
According to the type-A standard washing machine in GB/T 8629-2017,
washing procedure 4H, use standard detergent to continuously wash the
sample 3 times; after washing, hang to dry.
According to product standards or negotiated by interested parties, the number
of washes can also be specified separately, which needs to be stated in the test
report.
7.4 Sampling requirements
7.4.1 Sampling
Cut a circular sample, whose diameter is at least 150 mm, uniformly from the
fabric for filtration, or a square sample whose side length is at least 150 mm.
9.1.4 When performing a non-oily aerosol test, turn on the heater, to dry the
aerosol to form NaCl particles. When performing an oily aerosol test, it’s
unnecessary to turn on the heater.
9.1.5 After the instrument is turned on, it takes at least 30 min to make the
instrument in a stable state.
9.2 Set air flow
The air flow setting range shall be 0 L/min ~ 100 L/min. Under normal
circumstances, the air flow of the mask is 85 L/min (if multiple filter elements
are used, the flow shall be divided equally; for example, for dual filter elements,
the detection air flow of each filter element shall be 42.5 L/min; if multiple filter
elements are possible to be used separately, it shall be tested according to the
detection conditions of a single filter element); the air flow rate of the filter fabric
for the air filter is 32 L/min. The air flow rate can also be set according to product
standard requirements or customer requirements, which must be given in the
test report.
9.3 Start test
9.3.1 Mask
9.3.1.1 Place the sample on the sample fixture and fix it, so that the dust-facing
surface of the sample faces the direction of the airflow; prevent the sample from
twisting or edge gas leakage during the test.
Note 1: Test the mask as a whole without damage.
Note 2: A hot melt glue gun can be used to completely seal the breathing valve
cover of the mask, so as to prevent gas leakage at the edge of the
respirator valve.
9.3.1.2 Start the test button, and the gas will flow through the sample; observe
and record the pre-test filtration efficiency E of the sample; the result is accurate
to 0.1%. Use electronic pressure sensor or pressure gauge (5.1.3.4) to
measure the pressure difference on both sides of the sample; obtain the initial
resistance drop of the sample and record; the result is accurate to 0.1 Pa.
Note: It takes about 15 s to measure the pre-test filtration efficiency E and the
initial pressure drop.
9.3.1.3 Calculate the estimated filter time according to Formula (1); stop the test
immediately after the actual test time reaches the estimated filter time T. Use
the minimum filtration efficiency that is obtained during the entire filter time T as
the filtration efficiency of the sample; the result is accurate to 0.1%.
Note: Determine the final pressure drop according to product standards or
negotiated by interested parties.
9.3.2.4 Test the remaining samples in sequence according to the requirements
of 9.3.2.1 ~ 9.3.2.3.
10 Test data processing
10.1 Filtration efficiency
Take the average value of the filtration efficiency of 3 samples as the test result
of filtration efficiency of the sample; express in percentages (%). When the
average value is less than 90%, retain the result to one decimal place; when
the average value is 90% ~ 99%, retain the result to two decimal places; when
the average value is greater than or equal to 99%, retain the result to three
decimal places.
10.2 Initial pressure drop
Use the average value of initial pressure drop of 3 samples as the test result of
initial pressure drop of the sample, in Pascals (Pa); retain the result to one
decimal place.
10.3 Filter time
For the fabric for filtration, take the average of filter time of 3 samples as the
test result of filter time of the sample, in minutes (min); retain the result to one
decimal place.
10.4 Final pressure drop
For the fabric for filtration, if the final pressure drop is selected to be twice the
initial pressure drop, then, directly calculate twice the value of the initial
pressure drop of 10.2, as the test result of final pressure drop of the sample, in
Pascals (Pa); retain the result to one decimal place. If the final pressure drop is
determined by the product standard or negotiated by interested parties, take
the value as the test result, in Pascals (Pa); retain the result to one decimal
place.
10.5 Dust-hold capacity
For the fabric for filtration, respectively calculate the dust-hold capacity of each
sample according to Formula (2); take the average of dust-hold capacity of 3
samples as the test result of dust-hold capacity of the sample; retain the result
to one decimal place.
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
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 sha...