Polyacetal, or polyoxymethylene (POM), and polybutylene terephthalate (PBT) are included in the engineering plastics umbrella.
POM is a versatile thermoplastic with good hardness, friction and abrasion resistance. It is inherently self-lubricating and can replace metal parts. Uses include gear drives, pumps, conveyor belts, hand tools, toys, clock and watch parts, and medical devices with the main end-user sectors being automotive, consumer and office appliances, and electrical and electronic industries.
PBT is a thermoplastic polyester resin that has good impact strength, heat resistance and flow properties. It has many automotive applications such as mirror housings, fans, fuse boxes, cowl vents, and motor and ignition system components.
It also has uses in electrical and electronic products such as connectors, chip sockets, terminal boards, switches and circuit breakers.