Burning characteristics of common textile fibers

① Cotton fiber burns when it encounters a fire. It burns quickly and produces a yellow flame with an odor; it has a slight off-white smoke, which can continue to burn after leaving the fire. After the flame is blown out, there are still sparks that continue to burn, but the burning time is not long; After that, it can maintain the original velvet shape, and it can easily break into loose ash when touched. The ash is gray and soft powder, and the charred part of the fiber is black.

② Hemp fiber burns quickly, softens, does not melt, does not shrink, and produces yellow or blue flames, with the smell of burning grass; leaving the flame to continue to burn rapidly; there is little ash, and it is light gray or white grass dust.

③ Wool does not burn immediately after contacting the flame. It curls first, then smokes, and then the fiber starts to burn; the flame is orange-yellow, and the burning speed is slower than that of cotton fiber. It stops burning immediately after leaving the flame. It is not easy to continue burning, with burning hair and feathers. The ashes cannot keep the original fiber shape, but are irregular or spherical shiny dark brown brittle pieces, which will be crushed when pressed with fingers. The number of ashes is large and there is a burning smell.

④ Silk burns slowly, melts and curls, shrinks into a ball when burned, and has the smell of burning hair; it flashes slightly when leaving the flame, burns slowly, and sometimes self-extinguishes; the gray is a dark brown crispy ball, use your fingers Crush it.

⑤Viscose fiber has basically similar combustion properties to cotton, but it burns slightly faster than cotton fiber, has less ash, and is sometimes difficult to maintain its original shape. When viscose fiber burns, it will emit a slight hissing sound.

⑥ Acetate fiber, burning fast, there is sparks, melting and burning, there is a pungent acetic acid smell when burning; when leaving the flame, melting and burning at the same time; ash is black and shiny irregular block, you can use your fingers crush.

⑦Copper ammonia fiber has a fast burning speed, does not melt, does not shrink, and has the smell of burning paper; it continues to burn rapidly after leaving the flame; there is little ash, and it is light gray or gray.

⑧Nylon will cause the fiber to shrink when it is close to the flame. After contacting the flame, the fiber will quickly crimp and melt into a transparent gel with small bubbles.

⑨Acrylic fiber, while melting and melting, burning at the same time, the burning speed is fast; the flame is white, bright and powerful, sometimes slightly black smoke; there is a fishy smell or pungent smell similar to burning coal tar; leaving the flame to continue to burn, but the burning speed is slow; The ashes are dark brown irregular brittle balls, which are easily broken by fingers.

⑩Vinylon, the fiber shrinks rapidly when burned, burns slowly, the flame is very small, almost no smoke; when the fiber is melted in a large amount, it will produce a large dark yellow flame with small bubbles; it has a special smell of calcium carbide when burned; Leave the flame to continue to burn, sometimes it will self-extinguish; the ashes are dark brown irregular brittle beads, which can be crushed with fingers.

⑩Vinylon, the fiber shrinks rapidly when burned, burns slowly, the flame is very small, almost no smoke; when the fiber is melted in a large amount, it will produce a large dark yellow flame with small bubbles; it has a special smell of calcium carbide when burned; Leave the flame to continue to burn, sometimes it will self-extinguish; the ashes are dark brown irregular brittle beads, which can be crushed with fingers.

⑪Polypropylene, while crimping, melting and burning slowly; there is a bright blue flame, black smoke, and gelatinous dripping; there is a smell similar to burning paraffin; leaving the flame to continue burning, sometimes self-extinguishing; ashes are not Regular, lumpy, transparent, not easy to twist with fingers.

⑫ Chlorine fiber is difficult to burn; it melts and burns in the flame and emits thick black smoke; it extinguishes immediately after leaving the flame and cannot continue to burn; it has an unpleasant pungent chlorine odor when burning; the ashes are irregular dark brown lumps, which is not easy to use with fingers Twist broken.

⑬Spandex, close to the flame, first expands into a circle, then shrinks and melts; it melts and burns in the flame, the burning speed is relatively slow, the flame is yellow or blue; it burns while leaving the flame, slowly self-extinguishing; there is a special stimulation when burning Sexual smell; the ashes are white sticky lumps.