When judging the plastic raw materials, we can choose the method of investigating the burning phenomenon. After investigating the flammability, flame characteristics, dripping, delayed combustion and odor of the data during incineration, we can preliminarily judge the types and characteristics of the data. This judgment method is of great significance for understanding the function and application scope of the data.

Next, we will continue to introduce the determination methods of other plastic raw materials. These methods include physical function test, chemical analysis and instrumental analysis, which will provide more and more accurate reference for our work.

Basic judgment method: When burning, polyethylene (PE) presents a yellow flame, emits black smoke, and the bottom flame is green, and emits a foul smell. Polyethylene (PE) is famous for its excellent electrical insulation, chemical function and good plasticity, and is often used for communication cable insulation.

For polypropylene (PP), its appearance is smooth. When it is burned, the flame is yellow and blue, and it drops in liquid form, and it exudes the taste like a candle. Polypropylene (PP) is a white waxy solid with high transparency, non-toxicity and low water absorption. Its specific gravity is 91, which is one of the light plastics in common use and is often used for core insulation.

In addition, XLPE/XL-PVC is a thermosetting material, which is mainly used for insulation, and its x high temperature resistance grade can reach 150℃. When distinguishing, you can cut a piece of wire, remove the conductor, burn it from the middle with fire, and then pull it off hard to investigate whether the end face is round or not.

In addition, PU materials have excellent physical and chemical functions, and are often used for the sheathing of connecting wires and spring wires of construction machinery and other equipment. It is characterized by magnetism and good elasticity, and it will expand when burned, accompanied by liquid dripping.