The easy way to identify the composition of clothing fabrics is the burning method. Practice is to draw down a strand of cloth yarn containing warp and weft yarns at the sewing edge of the garment, ignite it with fire, observe the state of the burning flame, smell the smell emitted by the burning cloth yarn, look at the residue after combustion, so as to judge the durability of the label with the clothing labeled fabric composition is consistent with whether or not in order to identify the authenticity of the fabric composition.
First, cotton fiber and hemp fiber
Cotton fiber and hemp fiber are just near the flame that is burning, burning rapidly, the flame is yellow, blue smoke. The two in the burning smell and burn the difference between the ashes after burning is, cotton combustion issued by the smell of paper, hemp combustion issued by the smell of grass ash; after burning, cotton has very little powder ash, black or gray, hemp is a small amount of gray-white powder ash.
Second, wool fiber and silk
Hair on fire smoke, blistering when burning, burning slower, exuding burnt hair burning smell, burnt ash is mostly glossy black globular particles, finger pressure is broken. Silk fire shrinkage into a ball, burning slower, accompanied by sibilance, exudes a burnt hair smell, burned into a black-brown ball ash, hand-twisted that is broken.
Third, nylon and polyester
Nylon scientific name of polyamide fiber, near the flame that is quickly rolled up and melted into a white gel, in the flame of molten combustion drops and blisters, burning without flame, leaving the flame is difficult to continue to burn, exudes a celery flavor, after cooling light brown molten material is not easy to crushed. Polyester scientific name polyester fiber, easy to ignite, near the flame that is melting shrinkage, burning side of the melting side of the black smoke, yellow flame, exudes aromatic odor, burned ashes for the black-brown hard lumps, with a finger can be twisted.
Acrylic and polypropylene
Acrylic fiber scientific name of polyacrylonitrile fiber, near the fire softening melting shrinkage, black smoke after fire, the flame was white, away from the flame after rapid combustion, exudes the pungent and sour smell of burning meat, burned ash for irregular black hard lumps, twisting easy to break. Polypropylene fiber, polypropylene fibers, near the flame that is melting shrinkage, flammable, off the fire burns slowly and black smoke, the flame on the top end of the yellow, the bottom end of the blue, emitting a petroleum smell, burned ashes for the hard round light yellowish-brown particles, twisting fragile.
V. Polyvinyl chloride and polyvinyl chloride
Vinylon scientific name of polyvinyl alcohol formaldehyde fiber, not easy to ignite, near the flame fusion contraction, burning a little flame at the top, to be melted into a gelatinous fiber flames become larger, there is a thick black smoke, exudes a bitter smell, after combustion, the rest of the black bead-like particles, can be crushed with a finger. Chlorine polyvinyl chloride fiber, difficult to burn, off the fire that is, the flame is yellow, the lower end of the green white smoke, exuding irritating pungent pungent acidic smell, after burning the ashes for the black-brown irregular hard lumps, fingers are not easy to twist and crush.
Sixth, spandex and spandex
Spandex scientific name of polyurethane fibers, near the edge of the fire melt side burning, burning flame was blue, away from the fire to continue to melt and burn, emitting a special irritating odor, after combustion, the ash is soft fluffy black ash. Fluoroplastic scientific name of polytetrafluoroethylene fiber, ISO organization called it fluorite fiber, near the flame only melting, difficult to ignite, do not burn, the edge of the flame was blue-green carbonization, melting and decomposition, gas is toxic, melting material for the hard round black beads. Fluorine fiber in the textile industry is commonly used in the manufacture of high-performance sewing thread.
Seven, viscose fiber and copper ammonium fiber
Viscose fiber is flammable, burning quickly, the flame is yellow, emitting burnt paper smell, burnt ash less, was smooth and twisted band light gray or gray fine powder. Copper ammonium fiber commonly known as tiger cotton, near the flame that is burning, burning speed, the flame is yellow, emitting ester acid smell, burned ash is very little, only a small amount of gray and black ash.