国产三级精品一区二区三区,色欲亚洲一区二区在线播放,亚洲国产激情一区在线,亚洲中文无线字幕乱码一区二区

1. Light weight and low relative density

The relative density of engineering plastics is generally between 1.0~2.0, much lower than that of metals. It has light weight and can replace some traditional metal materials for aviation aircraft, vehicles and other fields.

2. High specific strength

Reinforced with glass fiber, carbon fiber and other fibers, the tensile strength can be greatly improved. The ratio of tensile strength to relative density is generally 1500-1700, even as high as 4000 (steel 1600, aluminum 1500). Tensile strength: refers to the stress that the material produces the maximum uniform plastic deformation. In the tensile test, the maximum tensile stress of the specimen until cracking is the tensile strength, and the results are indicated in MPa.

3. Excellent wear resistance and self-lubricating function

When engineering plastics are used as conflict parts, compared with wear-resistant metal alloys, the wear loss is less than 1:5, and fluoroplastics are better.

4. Excellent mechanical function

In a wide temperature range, many engineering plastics, especially reinforced engineering plastics, have excellent impact and fatigue resistance.

5. Excellent electrical insulation

Almost all engineering plastics have excellent electrical insulation and arc resistance, and can be among the excellent insulating materials

6. Chemical stability

It has good corrosion resistance to acid, alkali and general organic solvents.

7. Good standard stability of parts

8. High heat resistance

When ordinary engineering plastics are reinforced with different glass fibers, the temperature of ul for long-term continuous use exceeds 100 ℃, and the target of special engineering plastics generally exceeds 150 ℃.

9. Excellent shock absorption, noise elimination and sinking function for foreign matters

When engineering plastics are used as moving parts, they have no metal impact noise and have excellent shock absorption and noise elimination functions. In the presence of abrasive particles, foreign matters can be sunk, unlike metal which may be bitten or scratched before.

10. Outstanding processing function

Engineering plastics can be processed at low temperature (generally below 400 ℃) by injection molding, extrusion, blow molding and other methods. Products can be reprocessed by mechanical methods. The standard is stable, the interchangeability of products is strong, and the mold cost is low. Compared with metal processing, it can save about 50% of energy consumption, shorten working hours, and have a high product rate.

Source: Jiangmen engineering plastics http://xinghuagou.cn/