First, PC polycarbonate
Chemical and physical properties:
PC is an amorphous engineering material with exceptional impact strength, thermal stability, gloss, bacterial inhibition, flame retardant properties and stain resistance. The otched Izod impact stregth of the PC is very high, and the shrinkage rate is very low, generally 0.1% to 0.2%.
PC has good mechanical properties, but its flow characteristics are poor, so the injection molding process of this material is difficult. When choosing which quality PC material to use, it should be based on the final expectations of the product. If the plastic part requires high impact resistance, then a low flow rate PC material is used; conversely, a high flow rate PC material can be used, which optimizes the injection molding process.
Typical use:
Electrical and commercial equipment (computer components, connectors, etc.), appliances (food processors, refrigerator drawers, etc.), transportation industry (front and rear lights of vehicles, dashboards, etc.).
Second, POM POM
Chemical and physical properties:
POM is a tough, resilient material that retains excellent creep resistance, geometric stability and impact resistance even at low temperatures. POM has both homopolymer materials and copolymer materials. The homopolymer material has good ductility and fatigue strength, but is not easy to process. The copolymer material has good thermal stability, chemical stability and is easy to process. Whether a homopolymer material or a copolymer material, it is a crystalline material and does not easily absorb moisture.
The high degree of crystallization of POM results in a relatively high shrinkage rate of up to 2% to 3.5%. There are different shrinkage rates for a variety of different reinforced materials.
POM has a very low coefficient of friction and good geometric stability, making it ideal for gears and bearings. Because it also has high temperature resistance, it is also used in pipeline devices (pipe valves, pump housings), lawn equipment, etc.
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