1 density: small plastic density, to reduce the weight of mechanical equipment and energy saving is of great significance, especially for vehicles, ships, aircraft, spacecraft in terms of space.

2. The specific strength and specific rigidity high: high plastic absolute strength is inferior to the metal, but the density of plastics, so than strength (sigma B / P), stiffness (E / P) ratio is quite high. Reinforced plastics, in particular, are made of a variety of high strength fiber like, sheet and powdered metal or non metal fillers, and the ratio of the strength and stiffness of the metal is higher than that of the metal.

3 good chemical stability: the vast majority of the plastic has good acid, alkali, salt, water and gas performance, under normal conditions, they do not react with these substances.

4 electrical insulation, insulation, sound performance is good.

5.Plastic small friction coefficient, good wear resistance, good self lubricity, and high specific strength, small transmission noise, it can in a liquid medium, semi dry and dry friction condition to work effectively under 5. Wear resistance and self lubrication. It can be made of bearing, gear, cam and pulley and other parts of the machine, is very suitable for low speed, the load is not the occasion.

6 strong bonding ability.

7 molding and good performance.