POM POM Typical Applications: 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 (valves, pump housings), lawn equipment, etc.
Injection Molding Process Conditions: Drying: If the material is stored in a dry environment, drying is usually not required. Melting temperature: homopolymer material is 190~230C; copolymer material is 190~210C. Mold temperature: 80~105C. In order to reduce the shrinkage after molding, a higher mold temperature can be used. Injection pressure: 700~1200 bar. Injection speed: medium or high injection speed. Runners and gates: Any type of gate can be used. If a tunnel gate is used, it is best to use a shorter type. Hot nozzle flow channels are recommended for homopolymer materials. For the copolymer material, either an internal hot runner or an external hot runner can be used.
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.
PPE Polypropylene Typical application range: electrical appliances such as dishwashers, washing machines, etc., such as controller housings, fiber optic connectors, etc.
Injection molding process conditions: drying treatment: It is recommended to carry out drying treatment for 2~4 hours and 100C before processing. Melting temperature: 240~320C. Mold temperature: 60~105C. Injection pressure: 600~1500bar. Runners and gates: All types of gates can be used. Particularly suitable for use with handle gates and fan gates.
Chemical and Physical Properties: Typically, commercially available PPE or PPO materials are typically blended with other thermoplastic materials such as PS, PA, and the like. These hybrid materials are still generally referred to as PPE or PPO. Mixed PPE or PPO have much better processing characteristics than pure materials. The change in properties depends on the ratio of the mixture such as PPO to PS. The mixed material mixed with PA 66 has stronger chemical stability at high temperatures. This material has low hygroscopicity and its articles have excellent geometric stability. The material in which PS is mixed is amorphous, and the material in which PA is mixed is crystalline.
