POM sheet or board is made of POM plastic particles extruded at high temperature through an extruder and extruded through the corresponding mold mouth to get different thicknesses of plates. It is a thermoplastic engineering plastic with high melting point and high crystallinity. Due to the good characteristics of POM sheet, it is suitable for machining on bearing rollers, bearing rings, construction hardware, inserted gears, pump housings, screws, fine machining and garment industry parts, etc.