POM has high strength, stiffness, good elasticity and good wear resistance. Its mechanical properties are excellent, the specific strength can reach 50.5MPa, the specific stiffness can reach 2650MPa, and the metal is very close. The mechanical properties of POM vary little with temperature, and the change of copolymerized POM is slightly greater than that of homopolymer POM. The impact strength of POM is higher than that of ABS and PC. POM is sensitive to gaps, and gaps can reduce impact strength by as much as 90%. The fatigue strength of POM is very prominent, and after the action of 10 alternating loads, the fatigue strength can reach 35MPa, while PA and PC are only 28MPa. The creep property of POM is similar to that of PA, only 2.3% at 20℃, 21MPa and 3000h, and the effect of temperature is very small. POM has small friction factor and good wear resistance (POM> PA66> PA6> ABS> HPVC> PS> PC), the limit PV value is large, good self-lubrication. When POM products are grinding, it is easy to produce scream-like noise under high load.