The simple method to identify the composition of clothing fabric is combustion method. The method is to take a strand of cloth containing warp weft yarn at the sewing edge of the garment, light it with fire, observe the state of the burning flame, smell the smell of the burning cloth yarn, see the residue after burning, so as to judge whether it is consistent with the fabric composition marked on the durability label of the garment, so as to identify the authenticity of the fabric composition.

1、 Cotton fiber hemp fiber, both of which are just near the flame, burn rapidly, the flame is yellow, emitting blue smoke. The difference between the smell of the two combustion the ash after combustion is that the smell of paper is emitted by the combustion of cotton, the smell of grass wood ash is emitted by the combustion of hemp; after combustion, there are very few powder ashes of cotton, which are black gray, a small amount of ash white powder ashes are produced by the combustion of hemp.

2、 The hair fiber silk hair smoke when they are burned. When they are burned, they foam. The burning speed is slow, they give off the smell of burning hair. After burning, the ashes are mostly glossy black spherical particles, which will be broken as soon as the fingers are pressed. The silk shrinks into a ball shape in case of fire, the burning speed is slow, accompanied by a hissing sound, which gives off a burning smell of hair. After burning, it turns into a small black brown globular ash, which can be broken by twisting hands.

3、 Polyamide fiber is the scientific name of nylon polyester nylon. It quickly shrinks melts into white glue near the flame. It drips bubbles in the flame. There is no flame when it burns. It is difficult to continue to burn without the flame. It gives off the smell of celery. After cooling, the light Brown melt is easy to grind. Polyester fiber, a scientific name of polyester fiber, is easy to ignite. It melts near the flame emits black smoke when it is burned. It is yellow flame gives off fragrant smell. After burning, the ash is black brown hard block, which can be broken by fingers.

4、 Polyacrylonitrile fiber is the scientific name of polyacrylonitrile fiber. It softens shrinks near the fire. After the fire, it emits black smoke. The flame is white. After the fire, it burns quickly gives off the acrid smell of burning meat. After the fire, the ash is irregular black hard block, which can be easily twisted by hand. Polypropylene fiber, the scientific name of polypropylene fiber, is inflammable shrinkable near the flame. It burns slowly away the fire emits black smoke. The upper end of the flame is yellow the lower end is blue, which gives off the smell of petroleum. After burning, the ash is hard round light yellow brown particles, which can be easily twisted by hand.

5、 Vinylon vinylon, the scientific name of polyvinyl formal fiber, are easy to ignite. They melt contract near the flame. When they burn, there is a little flame on the top. When the fibers melt into glue, the flame becomes larger. There is thick black smoke, which gives off a bitter smell. After burning, there are small black beads left, which can be crushed by fingers. The scientific name of PVC fiber is PVC fiber, which is difficult to burn. The flame is yellow when it is off the fire. The lower end is green white smoke, which gives off pungent, pungent sour taste. After burning, the ash is black brown irregular hard block, the fingers are easy to twist.

6、 Polyurethane fiber is the scientific name of spandex fluoro spandex fiber. It burns near the fire. When it burns, the flame is blue. When it leaves the fire, it continues to melt burn, emitting a special pungent odor. After burning, the ash is soft fluffy black ash. Fluorine fiber is polytetrafluoroethylene fiber, which is called fluorite fiber by ISO organization. It only melts near the flame, is difficult to ignite, does burn. The edge flame is blue-green carbonization, which melts decomposes. The gas is toxic, the melt is hard round black bead. Fluorofiber is often used in the textile industry to make high-performance sewing thread.

7、 Viscose fiber cuprammonium fiber viscose fiber are inflammable, burning fast, the flame is yellow, sending out the smell of burning paper, less ash after burning, they are smooth twisted strip light gray gray white fine powder. Cuprammonium fiber is commonly known as tiger kapok. It burns near the flame with fast burning speed. The flame is yellow gives off acid taste of ester. After burning, there is very little ash only a small amount of black ash.