Material plastic POM has good comprehensive properties. It is the hardest among thermoplastics and one of the plastic materials whose mechanical properties are closest to those of metals. Its tensile strength, bending strength, fatigue strength, wear resistance and electrical properties are all very good. This is a kind of high crystalline polymer, the surface is smooth, the luster, the water absorption is small, the size is stable, the wear-resisting, the strength is high, the self-lubricity is good, the coloring is good, the oil resistance, the peroxide resistance and so on.