Difference
Polyethylene has excellent insulation performance. At room temperature, polyethylene is insoluble in any known solvent, and resistant to dilute sulfuric acid, dilute nitric acid and other acids of any concentration, as well as alkali and salt solutions of various concentrations. Polyethylene has a high degree of water resistance, and its performance can remain unchanged in long-term contact with water. Polyethylene has poor water vapor permeability, while oxygen, carbon dioxide and many organic materials have good vapor permeability.
Temperature - weather resistance: polyethylene will age and become brittle under the action of heat, light and oxygen. Generally, the service temperature of high-pressure polyethylene is about 800C, and that of low-pressure polyethylene is about 1000C. Polyethylene can withstand cold, and it has good mechanical properties at - 600C, and it has certain softness at - 700C.
Polyethylene terephthalate (PET)
Polyethylene terephthalate is a colorless transparent material with a certain luster (no qualitative), or an opaque milky white material (crystalline type). It is difficult to ignite, but after burning, although the flame is away from it, it can continue to burn. When burning, it will melt and burst into pieces. The flame is yellow, with early blue edge, small drops falling down, black smoke, and slightly sweet and pungent smell of mountain belt. The properties of pure PET are very poor, especially the impact strength and heat resistance, but after glass fiber reinforcement, all kinds of properties are greatly improved.
Polyethylene (PE)
Physical properties: polyethylene is nontoxic, tasteless and milky white. The density of 0.91-0.96g/cm3 is crystalline plastic. Polyethylene has a certain mechanical strength, but compared with other plastics, its mechanical strength is low and its surface hardness is poor.
