Several warp and weft yarns of two unknown types of webbing were dismantled and burned with a lighter. Some physical phenomena were observed during the combustion process to determine the raw materials of the warp and weft yarns. When burning, observe the flame, melting and odor, and the status of the ashes after burning.
The following are the physical properties of the two webbing materials for your reference:
Nylon webbing: Near flame means melting and melting, dripping and foaming does not continue to burn. It is celery-like hard, round, light, brown to gray, beaded polyester webbing: Near flame means melting and melting, dripping and rising. The foam can continue to burn, and a few of them have a very sweet and hard round with very weak smoke. The black or light brown cotton fibers and hemp fibers and hemp fibers are ignited immediately after the flame, burning quickly, the flame is yellow, and blue smoke is emitted. The difference between the odor and ash after burning is that cotton burns with a paper smell, and hemp burns with a plant ash smell; after burning, cotton has very little powder ash, black or gray, and hemp produces a small amount of off-white powder ash.
Polyamide fiber of nylon and polyester nylon (nylon) scientific name, it will be quickly rolled up and melted into a white colloid near the flame, melted in the flame, dripping and foaming, there is no flame when burning, it is difficult to continue to burn without the flame, and it emits the smell of celery After cooling, the light brown melt is not easy to be crushed.
The scientific name of polyester is polyester fiber. It is easy to ignite, and it melts near the flame. When it burns, it emits black smoke while melting, showing a yellow flame, emitting an aromatic scent. After burning, the ash is a dark brown hard mass, which can be twisted and broken with your fingers.
Acrylic and polypropylene (PP)
The scientific name of acrylic fiber is polyacrylonitrile fiber. It is softened and melted near fire. After the fire, it emits black smoke. The flame is white. It burns quickly after the flame. It emits the bitter odor of fired meat. The ashes after burning are irregular black lumps. .
Polypropylene fiber with a scientific name is near-flame, which is melted, flammable, burning slowly and emits black smoke from the fire, the upper end of the flame is yellow, the lower end is blue, and it emits the smell of petroleum. After burning, the ash is hard round light brown particles, easy to twist. broken.
Vinylon and chloroacrylon Vinyl formaldehyde fibers are not easy to ignite, and the near flame melts and shrinks. When burning, there is a little flame at the top. When the fibers are melted into a gel, the flame will become larger, there will be thick black smoke, and it will emit a bitter odor and burn. After the black bead-like particles remain, they can be crushed with fingers.
Polyvinyl chloride fiber with scientific name is difficult to burn, and it will extinguish immediately when it is out of fire. The flame is yellow, green and white smoke at the lower end, and it emits pungent and astringent spicy and sour taste. After burning, the ashes are dark brown irregular lumps, and the fingers are not easy to twist.
Polyurethane fiber with the scientific name of spandex and fluoroelastane spandex, melts and burns near the fire, the flame is blue when burning, and continues to melt after leaving the fire, emitting a special pungent odor. After burning, the ashes are soft fluffy black ash. The scientific name of PTFE is polytetrafluoroethylene fiber, which is called fluorite fiber by ISO organization. It only melts near the flame, it is difficult to ignite, and does not burn. The flame at the edge is blue-green carbonized, melts and decomposes, the gas is toxic, and the melt is hard and round black. Beads. Fluorine fiber is often used in the textile industry to make high-performance sewing threads.