The two categories of webbing weft yarns do not know the number of split root, respectively, with a lighter, the combustion process in a number of physical phenomena observed in order to determine the warp and weft yarn material. When burned to respectively flames, melting conditions and odors, condition ashes after burning were observed.     Here is the physical properties of the combustion parameters of two webbing material for your reference:     Nylon webbing: near the flame that is burning collapsing melting, dripping and blistering not directly continued burning like celery flavor hard, round, light brown to gray, beads     Polyester webbing: melt near the flame that is collapsing burning, dripping and bubbling continued burning energy, a small number of very weak sweet smoke hard round, black or light brown     Cotton fiber and hemp fiber     Cotton fiber and hemp fiber are just near the flame that is burning, burning quickly, the flame was yellow, take the blue smoke. Both burning odor and burning ashes after difference is that the issue of paper burning smell of cotton, hemp ash smell of burning issue; after combustion, cotton has little powder ashes, was black or gray, hemp is to produce a small amount of white powder ashes.     Nylon and polyester     After the nylon (nylon) scientific name of polyamide fiber, near the flame that quickly huddled melt into a white jelly, melt in the flames burning dripping and blistering, no flame burning, difficult to leave the flame continues to burn, emitting a celery flavor, cooling Hazel melt easily crush. Polyester scientific name of polyester fiber, easy to ignite, near the flame that is collapsing, black smoke when burned side melting side, yellow flame, emitting aroma, ashes after burning dark brown lumps with your fingers to crush.     Acrylic and polypropylene (PP)     Acrylic scientific name polyacrylonitrile fiber, near the fire to soften the melting shrinkage, black smoke after the fire, the flame was white, from the flame burn rapidly, emitting a smell of burning flesh bitterness, ashes after burning irregular black lumps, hand twist friable .     Polypropylene generic polypropylene fiber, near the flame that is collapsing, flammable, slow burning and black smoke from the fire, the upper yellow flame, the bottom blue, emitting a smell of oil, after burning ashes of hard round light brown particles, easy to hand twist broken.     Polyvinyl alcohol and polyvinyl chloride     Villeneuve scientific name polyvinylformal fiber, easy to ignite, near flame melting contraction, the top a little flame, until the fibers are melting into a gel combustion flame becomes large, thick black smoke, emitting bitter smell of incense, burned the remaining black bead-like particles, finger crushed.     Scientific name polyvinyl chloride polyvinyl chloride fibers, difficult to burn from the fire is put out, the flame was yellow, the bottom green white smoke, emitting pungent pungent spicy sour after combustion ashes irregular lumps of dark brown, easy to crush your fingers.     Spandex and Teflon     Spandex scientific name polyurethane fibers, melt the side near the fire burning, burning blue flame, leave the fire continues to melt burning, emitting a pungent smell special, post-combustion ashes soft fluffy black and gray. Scientific name Teflon PTFE fiber, ISO organization called fluorite fibers near the flame only melt, difficult to ignite, does not burn, the flame was blue-green edge carbonization, melting and decomposition, toxic gases, melt the hard round black beads. Teflon fiber in the textile industry, used in the manufacture of high-performance sewing thread.     Identification of fiber combustion method is simple, but not easy to judge blended products. Get the latitude and longitude direction (ie straight and horizontal direction) of each yarn separately extracting a combustion Kam.