1. Cotton fiber and hemp fiber
Both the cotton fiber and the hemp fiber burned immediately after the flame, burning rapidly, the flame was yellow and blue smoke. The difference between the odor of burning and the ash after burning is that cotton burns out the smell of paper and hemp burns out the smell of grass and wood; after burning, cotton has very little powder ash, which is black or gray, and hemp produces a small amount of off-white powder ash.
Second, wool fiber and silk
Mao met with fire and smoked, blistered when burning, the burning rate was slow, and emitted a burning smell of burning hair. After burning, the ash was mostly glossy black spherical particles, which were broken when pressed. The silk shrunk into a mass when fired, and it burned slowly, accompanied by hissing sounds, emitting a burning smell of hair. After burning, it formed into a black-brown ball-shaped ash, which was broken by hand twisting.
3. Nylon and polyester
Polyamide fiber, which is a scientific name of polyamide fiber, quickly shrinks and melts into a white gel when it is near the flame. It melts and drips in the flame and blisters. There is no flame when burning. It is difficult to continue burning when leaving the flame. It emits a celery smell. After cooling, the light brown melts Things are not easy to break. The scientific name polyester fiber, polyester, is easy to ignite. It melts and shrinks when it is near the flame. When burning, it emits black smoke when melting and emits a yellow flame. It emits an aromatic smell. The ash is a dark brown hard block after burning. It can be twisted with fingers.
4. Acrylic and polypropylene
Acrylic fiber scientific name polyacrylonitrile fiber, softening and shrinking near fire, black smoke after fire, the flame is white, burns quickly after the flame, emits the bitter smell of burning meat, after burning, the ash is irregular black hard block, hand twist is brittle . Polypropylene scientific name polypropylene fiber, which melts and shrinks near the flame, is flammable, burns slowly from the fire and emits black smoke, the upper end of the flame is yellow, the lower end is blue, it emits the smell of petroleum, and the ash after burning is a hard round light yellow brown particle, easy to twist by hand broken.

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