1. Density method: check the density of various plastic hooks, use liquid as the medium to test the plastic floating and floating in the liquid medium, to roughly distinguish the plastics, such as a piece of plastic placed in water, floating on the water surface can be determined, raw materials Not PVC (due to the density of PVC >1).
2. Combustion method: mainly check the color of the flame and the odor and smoke emitted during the burning. Generally speaking, the burning flame of the polyolefin raw material is mostly blue or light blue, the smell is mild and light, and the smoke is white, Most of the raw materials with benzene or chlorine are easy to emit black smoke after burning, and the smell is strong. In addition, such as PE, PP has dripping phenomenon, while PVC and so on, there is no drenching, but there is self-extinguishing phenomenon.
3, optical method: mainly to examine the transparency of raw materials, generally commonly used transparent raw materials: PS, PC, PMMA, AS; translucent raw materials are: PE, random copolymer PP, homopolymer PP, soft PVC, transparent ABS, etc. Other materials are substantially opaque.
4, color discrimination method: Generally speaking, if the raw material without additives, if it contains double bonds, the color will be slightly yellow, such as ABS, due to the copolymerization of butadiene, the polymer still contains double bonds after polymerization. Therefore, it will be slightly yellow.