1. Light weight and high specific strength. The plastic is light in weight, and the density of general plastics is between 0.9 and 2.3 g/cm3, only 1/8~1/4 of steel and 1/2 of aluminum, and the density of various foams is lower. 0.01~O.5g/cm3. The strength calculated in terms of unit mass is called specific strength, and the specific strength of some reinforced plastics is close to or even exceeds that of steel.
2. Excellent electrical insulation properties. Almost all plastics have excellent electrical insulation properties, such as minimal dielectric loss and excellent arc resistance, which are comparable to ceramics.
3. Excellent chemical stability. Generally, plastics have good corrosion resistance to chemicals such as acid and alkali. In particular, the chemical corrosion resistance of polytetrafluoroethylene is better than that of gold, and it can even resist the corrosion of strong corrosive electrolytes such as "Wangshui". Plastic King". 4. Anti-friction and wear resistance. Most plastics have excellent friction, wear and self-lubricating properties. Many of the friction-resistant parts made of engineering plastics use these characteristics of plastics. When some solid lubricants and fillers are added to the wear-resistant plastics, the number of frictions can be reduced or the wear resistance can be further improved.
5. Light transmission and protective performance. Most plastics can be used as transparent or translucent articles, where polystyrene and acrylate plastics are as transparent as glass. The plexiglass chemical name is polymethyl methacrylate and can be used as an aerospace glass material. Plastic films such as polyvinyl chloride and polypropylene have good light transmission and heat retention properties, and are widely used as agricultural films. Plastics have a variety of protective properties and are therefore often used as protective articles.
6. Excellent noise reduction performance. Some plastics are flexible and elastic. When they are subjected to frequent mechanical shocks and vibrations, internal viscous internal friction is generated, which converts mechanical energy into heat energy. Therefore, it is used as a vibration damping material in engineering.
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