Introduction of Engineering Plastics

Introduction of 8 common high-temperature engineering plastics
[Common high-temperature plastics: fluorine plastics, PEEK, high-temperature nylon, PPS, PI, PSU, PAR, LCP].

P lastics according to long-term use temperature classification, can be divided into general plastics, engineering plastics and high temperature engineering plastics, of which high temperature plastics are also known as heat-resistant plastics, high-performance plastics, special engineering plastics and so on.

The long-term use temperature of general plastics is below 100℃. Usually includes PE, PP, PS, PVC, ABS. General purpose plastics are the largest type of plastic we use on a daily basis, often used as packaging, daily necessities, toys and so on.
The long-term use temperature of engineering plastics is about 100℃ to 150℃. The five major engineering plastics include PA, POM, PBT, PC and PPO. Usually used in mechanical parts, automobiles, electrical and electronic fields.
The use temperature of high temperature engineering plastics is above 150 ° C, and such materials usually have excellent machining properties, aging resistance, dimensional stability and excellent electrical properties in addition to high heat resistance and flame retardant. It can be used to replace metal materials, and is widely used in electronic appliances, aerospace, medical equipment, automobiles, and military fields. It's the material at the top of the plastic pyramid.

We often say that the plastic king - polytetrafluoroethylene (Teflon) has the following characteristics:

(1) A high degree of chemical stability: it has a good chemical inertia, strong acids, strong bases or strong oxidants and organic solvents do not work on it.
(2) Good thermal stability: the cracking temperature is above 400 ° C, so it can work normally in the temperature range of -200 ° C ~ 300 ° C.
(3) Good anti-friction: the coefficient of friction between PTFE materials is 0.1 ~ 0.2, the coefficient of dry friction between metals is 0.2 ~ 0.3, and in the case of liquid lubrication is 0.02 ~ 0.04, the coefficient of static and static friction is relatively small, and the coefficient of starting friction is almost the same as the coefficient of dynamic friction.
(4) Excellent self-lubricity: the surface of PTFE material has outstanding surface self-lubricity, and almost all viscous substances can not adhere to its surface.