There are four kinds of combustion method, microscope method, handle visual method and chemical reagent test method

Combustion method

Definitions: the fabric placed on the fire to burn, to observe the fiber after heat deformation, flame, burning difficulty speed, emitting a smell and color, the shape of the ash after combustion and the remainder, hardness until methods were identified.

1, simple combustion method

Cotton, in the event of a fire that is burning, fast speed, the flame is yellow, slightly gray smoke and the smell of burning paper, classes of burnt ember valuables was dark gray.

Hemp: similar to that of cotton, but ash is gray and white.

Wool, flame-retardant, encounter as a first crinkly, after burning fiber foaming and fire is orange, in the smell of burning protein, burning faster than cotton, ashes, is forming dark brown shape, pressing by hand is broken, into a loose powder.

Silk: combustion shape and hair fiber is similar, first rolled into a ball, the combustion speed was faster than that of wool, the taste of the protein, but the smell to smaller than wool. Brown pellet after burn.

Viscose fiber and cotton is similar to that of the burning speed faster than cotton, yellow flame, burning smell, ash is gray or grayish.

Such as: when burning melt drop, the flame was blue. Black smoke generation top, slightly fragrant smell, ashes a lump, a broken finger pressure.

Nylon: fire, fire first curled, melt into transparent jelly, hot wire can be pulled out, the taste of celery. Ash is not fragile.

2, combustion coloring method

Fiber types near the flame flame leaving the flame burning odor residue form wet state color

Tencel fiber is melting rapidly burning burning smell burning to shrink black gray and black Lan Qing

Modal fiber melting shrinkage burning rapidly continue burning black and gray ash burning smell

Soybean protein fiber contraction combustion is not melting, black smoke is not easy to spread the taste crisp black grey brown singeing

The bamboo fiber does not melt does not shrink rapidly burning to burn burning taste black blue gray

Chitin fiber does not melt does not shrink rapidly burning black black continue burning burning smell

Microscope observation method

Fiber type / longitudinal morphology / cross section

Tencel fiber / smooth / more regular round or oval, with skin core layer

Modal fiber / longitudinal 1~2 root groove / irregular similar to the waist round, more smooth, with skin core

Soybean protein fiber / surface has irregular grooves and island shaped concave convex / flat dumbbell shape and waist round

Bamboo fiber / surface has a groove / zigzag type, there is a skin core layer

Viscose chitin fiber / surface has obvious groove / edge saw tooth type, the core layer has a clear small gap