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Basic data
| Standard ID | SN/T 5240-2020 (SN/T5240-2020) |
| Description (Translated English) | (Import and export textiles heat release rate determination cone calorimeter method) |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | W04 |
| Classification of International Standard | 59.010 |
| Word Count Estimation | 13,123 |
| Date of Issue | 2020-08-27 |
| Date of Implementation | 2021-03-01 |
| Regulation (derived from) | General Administration of Customs Announcement No. 98 [2020] |
| Issuing agency(ies) | General Administration of Customs |
SN/T 5240-2020: (Import and export textiles heat release rate determination cone calorimeter method)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Import and export textiles-Heat release rate-Test method of cone
calorimeter method
The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards
2020-08-27 release
2021-03-01 implementation
Issued by the General Administration of Customs of the People's Republic of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. Publication of this document
The agency is not responsible for identifying these patents.
This standard was proposed and managed by the General Administration of Customs of the People's Republic of China.
Drafting organizations of this standard. Hangzhou Customs Technology Center of the People's Republic of China, Beijing Institute of Fashion Technology.
The main drafters of this standard. Xie Weibin, Wu Jianjian, Pan Jianjun, Wang Ran, Chen Qinwei.
Determination of heat release rate of import and export textiles. Cone calorimeter method
1 Scope
This standard specifies the method for measuring the heat release rate of textiles with a cone calorimeter.
This standard applies to the determination of the heat release rate of various fabrics and their products.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 6529 Standard atmosphere for textile humidity control and testing
GB/T 16172-2007 Test method for heat release rate of building materials
GB 18401-2010 National Basic Safety Technical Code for Textile Products
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Textiles
It is made of natural fiber and chemical fiber as the main raw materials through spinning, weaving, dyeing and other processing techniques or through sewing and compounding techniques.
Products, such as yarn fabrics and their finished products.
[GB 18401-2010, definition 3.1]
3.2
Heat release rate; HRR
The rate of heat released per unit area of the ignited sample under a certain heat flux radiation intensity, in kW/m2.
3.3
Oxygen consumption principle
The proportional relationship between the mass of oxygen consumed during combustion and the amount of heat released.
[GB/T 16172-2007, definition 3.7]
3.4
Irradiance
< A point on the surface> The radiant flux incident on a surface element (including the point and the unit area) at a certain point on the surface of the sample divided by the
The area of the face element.
Note. The convective heat transfer on the specimen can be ignored when positioned horizontally. Therefore, this standard uses the term “irradiance” instead of “heat flow” to better express
Bright radiation is the main heat transfer method.
[GB/T 16172-2007, definition 3.4]
3.5
Orientation
During the test, the exposed surface of the sample is on the plane, vertical or horizontal.
[GB/T 16172-2007, definition 3.6]
3.6
Flashing
A burning phenomenon with a flame duration of less than 1 s that occurs on or above the sample surface.
[GB/T 16172-2007, definition 3.2]
3.7
Ignition
A continuous flame appears.
[GB/T 16172-2007, definition 3.3]
3.8
Sustained flaming
A flame lasting more than 10 s appears on or above the sample surface.
[GB/T 16172-2007, definition 3.10]
3.9
Transitory flaming
A flame with a duration of 1 s to 10 s appears on or above the surface of the sample.
[GB/T 16172-2007, definition 3.11]
4 Principle
This method is based on the principle of oxygen consumption. When a general substance is burned, every 1 kg of oxygen will release 13.1×103 kJ of heat. in
Under ambient atmospheric conditions, place the sample under the specified external heat radiation conditions of 0 kW/m2 to 100 kW/m2, and measure with a cone calorimeter
The oxygen concentration and exhaust flow rate when the sample is burned, and the heat release rate characteristics of the test sample are evaluated.
5 Apparatus and equipment
5.1 Cone Calorimeter. See Figure A.1 in Appendix A.
5.2 Grid. See Figure B.1 in Appendix B.
5.3 Balance. a sense of 0.01 g.
6 Test environment
Relative humidity 20% ~ 80%, temperature 15 ℃ ~ 30 ℃, no obvious air flow disturbance environment.
7 Sample preparation
7.1 Sample humidity control
The samples shall be humidified for at least 24 h in the standard atmosphere specified in GB/T 6529.
7.2 Specimen
7.2.1 The size of a single sample is 100 mm × 100 mm.
7.2.2 Three single samples are superimposed to form a combined sample.
7.2.3 Under any irradiance, prepare 3 combined samples for parallel testing.
7.3 Sample installation
7.3.1 Wrap the humidity-conditioned combined sample with a single-layer aluminum foil with a thickness of 0.025 mm ~ 0.04 mm, with the glossy surface of the aluminum foil facing the sample;
The aluminum foil should be cut in advance so that it can cover the bottom and sides of the sample and extend beyond the upper surface of the sample by at least 3 mm; the sample should be placed on the aluminum
In the middle of the foil, wrap the bottom and sides of the foil, and cut off the excess aluminum foil so that the aluminum foil does not exceed 3 mm of the upper surface of the sample.
7.3.2 The composite sample covered with aluminum foil is placed on the positioning frame as shown in Figure A.3.
a) Place the positioning frame upside down on a flat surface and put it into the grid (see Figure B.1);
b) Put the combined sample covered with aluminum foil into the positioning frame with the test side facing down
c) Put a refractory fiber layer (density 65 kg/m3) on the top, just beyond the edge of the positioning frame;
d) Place the sample mounting frame (see Figure A.2) on top of the refractory fiber layer, install it into the positioning frame, and press it tightly;
e) Place the positioning frame on the sample mounting frame.
8 Test procedure
8.1 Safety measures
Take appropriate precautions for safety protection. In the combustion test, the test sample may emit toxic and harmful gases when exposed to the radiation cone, and
With high temperature and burning, operators should wear protective masks and protective gloves.
8.2 Test preparation
8.2.1 Check the CO2 filter and moisture filter, and replace the adsorbent if necessary. Drain the condensed water in the cold trap, and the normal operation of the cold trap
The temperature does not exceed 4 ℃.
8.2.2 Adjust the distance between the lower surface of the radiation cone and the upper surface of the sample to (25 ± 1) mm.
8.2.3 Turn on the power of the radiation cone, fan, gas analyzer, weighing equipment and pressure sensor.
8.2.4 Adjust the exhaust flow of the fan to (0.024±0.002) m3/s.
8.2.5 Calibrate the instrument as prompted and record the instrument calibration constant C.
8.2.6 Adjust the radiation illuminance.
Note. When the radiant illuminance is not clearly specified, the radiant illuminance of 25 kW/m2, 35 kW/m2, 50 kW/m2 corresponds to small, medium, and large fires respectively.
Line test.
8.3 Test
8.3.1 Place the sample prepared in 7.3 on the weighing device, and record the mass of the sample before the test to the nearest 0.01 g.
8.3.2 Test the oxygen mole fraction value with an oxygen analyzer, test once every 5 s, and take the average value of the oxygen mole fraction in 60 s as the initial value
8.3.3 Move into the igniter, according to the type of shielding layer (see A.2), remove the radiation shielding layer according to the following regulations, and test the oxygen mole fraction
Real-time value
a) Water-cooled shielding layer, remove the shielding layer, move in and turn on the igniter at the same time, and start the test.
b) Non-water-cooled shielding layer, remove the shielding layer within 10 s after moving into the igniter, turn on the igniter while removing the shielding layer, and start
test.
8.3.4 When the flame appears, record the time it, turn off and remove the igniter. If the flame goes out after the igniter is turned off, move to the ignition again
At the same time, open the igniter and keep the igniter in working condition to maintain combustion until the end of the test. Record the above situation in the test report.
8.3.5 In any of the following cases, end the test and record the remaining mass em of the sample to the nearest 0.01 g.
a) Return to the oxygen mole fraction value before the test for 10 min;
b) The mass of the sample becomes zero;
c) The sample has not been ignited within 30 minutes;
d) Continue to burn for 30 minutes.
8.3.6 Remove the test sample.
8.3.7 Repeat the above steps to test another 2 combined samples.
9 Calculation
9.1 Heat release rate per unit area
Calculated by formula (1).
10 Test report
The test result is only related to the characteristics of the sample under specific test conditions, and the result is not an evaluation of the potential fire hazard of the textile in use
The only standard of sex. The test report should include the following.
a) Number of this standard;
b) The description of the sample;
c) The environmental temperature and humidity during the test and the test date;
d) The correction constant C of oxygen consumption analysis;...
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