What are the testing methods and instruments for the combustion characteristics of textiles?

1. Fabric combustion performance test: It is mainly used to test the combustion breadth (carbonized area and damage length), afterburning time and smoldering time of the sample. According to the relative position of the sample and the flame, it can be divided into vertical combustion method, horizontal combustion method and 45 degree combustion test method. Test principle: The vertical combustion method is to place a sample of a certain size perpendicular to the specified combustion test box, ignite it with a specified ignition source for 12s, and measure the after-burning time and smoldering time of the sample after removing the ignition source. Damaged length. The test principle of the horizontal test method and the 45-degree combustion test method is the same as that of the vertical test, but the ignition time is different. Compliant with standards: ASTM D6413-99, DOC-FF 3/71, CALIF TB-117, GB/T 5455, CPAI-84; ISO 3795, FMVSS 302, DIN 75200, SAE J369, ASTM D5132, JIS D1201, AU169, FZ /T 01028; ASTM D1230, FTMS 191-5908, CFR 16 Part1610, CAL IF TB117, NFPA702, GB/T 14644 2. Limiting oxygen index test: Limiting oxygen index: Under the specified test conditions, keep the material in a burning state The minimum concentration of oxygen in the nitrogen-oxygen mixture. Test principle: Fix a sample vertically in a transparent combustion cylinder of an upwardly flowing oxygen and nitrogen mixture, ignite the top of the sample, and observe the combustion characteristics of the sample. The minimum value of the oxygen concentration is estimated through a series of experiments at different oxygen concentrations compared to the established criteria. Compliance with standards: ISO 4589-2, ASTM D2863, GB/T2406, GB/T5454 3. Smoke density test: Smoke density refers to the measurement of the amount of smoke produced by the material under the specified test conditions, which reflects the opacity of the smoke. The greater the smoke density of the material, the more unfavorable it is to evacuate and extinguish the fire. Test range: The plastic combustion smoke density tester is a smoke density test for samples of sheet-like materials, composite materials or assemblies with a thickness not exceeding 25mm. This testing instrument is not only suitable for all plastics, but also for testing of other materials such as rubber, textile coverings, painted surfaces, wood, etc. Test principle: Place the sample horizontally in the test box, and expose the upper surface of the sample to a thermal radiation source with a constant irradiance set within 50KW/m2. The resulting smoke was collected in a test chamber equipped with a photometer. Measure the attenuation of the beam after passing through the smoke. Compliant with standards: GB8323.2-2008, ISO5659.2-2006. 4. Test of combustion oxygen consumption and heat release rate: The heat release rate and total release rate of materials during combustion are the most important parameters in their combustion performance, which can be compared Accurately measuring the rate of heat release during material combustion is very important for predicting fire hazards. At present, the main test method is cone calorimetry. Test principle: The sample burns under the thermal radiation of the conical electric heater, the flame consumes a certain concentration of oxygen in the air, and releases a certain combustion calorific value. The instrument can measure the rate of heat release, the amount of CO and CO2 produced, the rate of oxygen consumption, and the amount of smoke released. Compliant with standards: ISO 5660, ASTM E1354, ASTM E1474, ASTM E1470, ASTM F1550, ASTM D6113, NFPA 264, CAN ULC135, BS 476. More about Combustion Tester: http://www.ranshaoceshi.com/

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