What is POM and what are its characteristics and uses
English name of POM: Polyoxymethylene, abbreviated as polyoxymethylene. The scientific name of polyoxymethylene is polyoxymethylene (POM), also known as Saigang and Trane. It is obtained by polymerization of formaldehyde as raw materials. POM-H (polyoxymethylene homopolymer) and POM-K (polyoxymethylene copolymer) are thermoplastic engineering plastics with high density and high crystallinity. Has good physical, mechanical and chemical properties, especially excellent friction resistance.
Polyoxymethylene is a linear polymer with no side chains, high density and high crystallinity, and has excellent comprehensive properties.
Polyoxymethylene is a hard and dense material with a smooth, shiny surface, light yellow or white, and can be used for a long time in the temperature range of -40-100°C. Its wear resistance and self-lubricity are also superior to most engineering plastics, and it has good oil resistance and peroxide resistance. Very intolerant to acids, strong alkalis and moonlight ultraviolet radiation.
Polyoxymethylene has a tensile strength of 70MPa, low water absorption, stable dimensions, and gloss. These properties are better than nylon. Polyoxymethylene is a highly crystalline resin, which is the toughest among thermoplastic resins. It has high thermal strength, bending strength, fatigue resistance strength, and excellent wear resistance and electrical properties.
POM is a crystalline plastic with obvious melting point. Once it reaches the melting point, the melt viscosity drops rapidly. When the temperature exceeds a certain limit or the melt is heated for too long, it will cause decomposition.
POM has good comprehensive properties. It is the hardest among thermoplastics. It is one of the plastic materials whose mechanical properties are closest to metal. Its tensile strength, bending strength, fatigue strength, wear resistance and electrical properties are all Very good, can be used for a long time between -40 degrees and 100 degrees.
According to the different molecular chain structure, polyoxymethylene can be divided into homopolyoxymethylene and copolyoxymethylene. The former has high density, crystallinity, and melting point, but has poor thermal stability, narrow processing temperature (10 degrees), and slightly lower stability to acid; The latter has low density, crystallinity, and melting point, but has good thermal stability, is not easy to decompose, and has a wide processing temperature (50 degrees)
The disadvantages are: corrosion by strong acid, poor weather resistance, poor adhesion, close thermal decomposition and softening temperature, and low oxygen limit index. They are widely used in the automobile industry, electronic appliances, mechanical equipment, etc. It can also be used as a faucet, frame window, and wash basin.