The simple method to identify the composition of clothing fabric is combustion. The method is to take out a wisp of cloth yarn containing warp and weft at the seam of the garment, ignite it with fire, observe the burning flame, smell the smell of cloth yarn after burning, and see the residue after burning, so as to judge whether it is consistent with the fabric composition marked on the garment durability label, so as to distinguish the authenticity of the fabric composition.
1.Cotton fiber and hemp fiber
Cotton fiber and hemp fiber are just near the flame burning, burning quickly, the flame is yellow, blue smoke. The difference between the smell of burning and the ashes after burning is that the cotton burning gives off the smell of paper and the hemp burning gives off the smell of wood ash. After burning, cotton has very little powder ash, black or gray, hemp will produce a small amount of grayish white powder ash.
2.Wool fiber and silk
Hair encounters fire to emit smoke, when burning bubble, burning speed is slower, send out the burnt stink that burns a hair, after burning ash is the black ball grain that has burnish more, finger is pressed namely broken. Silk shrinks into a lump when exposed to fire, burning slowly, with a hissing sound and a smell of burning hair.
3.Nylon and polyester
Polyamide fiber, near the flame that quickly rolled into a white glue, in the flame of melting combustion dripping and foaming, burning without a flame, leaving the flame difficult to continue to burn, send out a celery flavor, cooling after light brown melt is not easy to grind. Polyester fiber, easy to ignite, near the flame that melting shrinkage, burning the side of the melting smoke, yellow flame, send out a sweet smell, burn ashes for black brown hard, with fingers can be broken.
4. Acrylic and polypropylene
Polyacrylonitrile fiber, near the fire to soften melt shrinkage, fire smoke, the flame is white, from the flame after rapid combustion, exhaling the bitter smell of burning meat, burning ashes for irregular black hard, fragile hands. Polypropylene fiber, near the flame that is melting shrinkage, flammable, from the fire burning slowly and emit black smoke, flame top yellow, bottom blue, emitting a smell of oil, burning ashes for hard round faecal-brown particles, hand twist fragile.
5.PVA and PVC
Pva fiber, not easy to ignite, near the flame melting shrinkage, burning when the top of a little flame, to be the fiber into a gel flame to become larger, there is a thick black smoke, send out a bitter smell, burning after leaving small black bead particles, can be crushed by fingers. Polyvinyl chloride (PVC) fiber, difficult to burn, from the fire is extinguished, the flame is yellow, the lower end of the green and white smoke, emitting pungent pungent sour taste, burning ashes for black and brown irregular hard lump, fingers are not easy to twist broken.
6.Spandex and fludex
Polyurethane fiber, near the fire side melting and burning, the flame is blue when burning, leaving the fire to continue to melt burning, emitting a special pungent odor, burning ashes for soft fluffy black ash. Flon scientific name polytetrafluoroethylene fiber, ISO organization called it fluorite fiber, near the flame only melting, difficult to ignite, not burning, the edge of the flame is blue-green carbonization, melting and decomposition, toxic gas, melting for hard round black beads. Fluoron fiber is often used to make high performance sewing thread in textile industry.
7.Viscose fiber and cuprammonium fiber
Viscose fiber is inflammable, burning quickly, the flame is yellow, send out the smell of burning paper, after burning ash is little, showing a smooth twisted strip of light gray or white powder. Copper ammonium fiber common name tiger kapok, near the flame that is burning, burning speed is fast, the flame is yellow, send out ester sour taste, after burning ash is very few, only a small amount of gray black ash.