For textile flammability characterization , availability limiting oxygen index, ie the material continues to burn fuel to maintain the minimum required percentage of the volume of oxygen . By limiting oxygen index (LOI) the textile materials into four categories : non-combustible (LOI ≥ 35%) of textiles, such as most metal fibers, carbon fibers, asbestos , boron fiber , glass fiber , PBO fiber , PBI ( polybenzimidazole ) fibers , polyimide fibers ; flame (LOI = 26 ~ 34%) textile products , such as Kevlar, Teflon , polyvinyl chloride , modified acrylic, modified polyester , modified polypropylene , modified polyvinyl alcohol , modified viscose , PPS ( polyphenylene sulfide ) , seaweed fiber, etc. ; combustible (LOI ≥ 26% ≤ 34%) textiles, such as polyester , nylon, polyvinyl alcohol , wool, silk , acetate fiber, etc. ; flammability (LOI ≤ 20) textiles, such as polypropylene, acrylic , cotton, linen, viscose fiber, bamboo fiber, soybean protein fiber, milk protein fiber. Although non-combustible fiber flame retardant effect is good, but most suitable for wearing or home , and most people used natural or chemical fibers are flammable or combustible , and only for such modification or finishing of textiles in order to improve their fire-retardant performance , that is, having a flame retardant capabilities through a variety of ways to reach into the textile flame retardant effect .
Fiber flame retardant fabric approach is to prevent or reduce fiber thermal decomposition , isolated or diluted oxygen, rapid cooling using its termination burning. To achieve the above object , a flame retardant function is generally the flame retardant polymer by polymerization , blending , copolymerization, composite spinning , and other technological then go into the fiber or the flame retardant coating finishing methods layer on the fiber surface or penetrate inside the fiber . In practical applications, often using a variety of flame retardant, synergistic effect of two or more ways to achieve flame retardant effect .
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