What are the testing items for flame retardant fabrics?

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Flame retardant fabrics flame retardant clothing clothing flame retardant properties

The testing of flame retardant fabrics is a complex process that requires testing many items. Specific test items include flame retardant performance, breaking strength, tearing strength, moisture permeability, stiffness, shrinkage, abrasion resistance, thermal protection, radiant heat, contact heat, etc. It is also necessary to test the different functions of some multi-functional flame-retardant fabrics such as waterproof, anti-static, oil-proof, mosquito-proof, and UV-proof. Shrinkage: The shrinkage of flame-retardant clothing refers to the percentage of fabric shrinkage after washing or soaking in water. Test results to prove whether the garment has shrunk. Different materials have different shrinkage rates, and the acceptance range is also inconsistent. Generally speaking, it is acceptable if the shrinkage of woven fabrics does not exceed 3% in the warp and weft directions, and that of knitted fabrics does not exceed 5%.

Tear and breaking strength: The tearing strength of flame-retardant fabrics indicates the strength of the fabric. On the one hand, stretching indicates the amount of force required to break, and on the other hand, it indicates the morphological stability of the fabric. and elasticity. The less likely it is to tear, the stronger the fabric is. Breaking strength of flame-retardant fabrics: A sample of specified size is stretched at a constant elongation rate until it breaks, and the breaking strength and breaking elongation are recorded. Cut two sets of specimens, one set is the longitudinal or longitudinal specimen, and the other is the weft or transverse specimen. Each group of specimens shall include at least 5 specimens. Strength of tearing of flame-retardant fabrics: Fix the sample on the clamps, make a cut on the sample, and release the pendulum in a larger position. When the movable clamps leave the fixed clamps, the sample is pulled along the direction of the cuts. Tear, convert the work done by tearing a certain length of fabric into tearing force.
Carbon length: The carbon length of flame-retardant fabrics refers to the length of carbonization of the fabric after the fabric is ignited by an open flame for a certain period of time and the combustion is completely extinguished. Indicates the flame retardant properties of the fabric. Formal flame retardant fabric testing methods, the combustion experiment method is mainly used to test the burning extent (charring area and damage length), afterburning time and smoldering time of the sample. Our country currently mainly uses GB/T5455-1997 “Vertical Method for Textile Combustion Performance Testing” to test the flame retardant properties of clothing. The principle is to place a sample of a certain size vertically in a prescribed combustion test chamber, ignite it with a prescribed fire source for 12 seconds, remove the fire source and measure the afterburning time and smoldering time of the sample. After the smoldering stops, press The length of the damage is measured using prescribed methods. This method can be used to determine the flame retardant properties of clothing fabrics, decorative fabrics, tent fabrics, etc.
：Textile

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