POM (polymerized by formaldehyde or the like. POM -H (polyoxymethylene homopolymer), POM-K (polyoxymethylene copolymer) is a high-density, high-crystallinity thermoplastic engineering plastic. It has good physical and mechanical properties. Chemical properties, especially excellent friction resistance.
POM is a crystalline plastic with a sharp melting point. Once the melting point is reached, the melt viscosity drops rapidly. Decomposition occurs when the temperature exceeds a certain limit or the melt is heated for too long. Copper is a POM degradation catalyst and copper or copper materials should be avoided where it is in contact with the POM melt. 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.
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.
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