Pok is a new type of engineering plastics with the most outstanding wear resistance at present. Its wear resistance is 14 times that of POM, the wear amount is very low, the dimension stability is high in long-term use, and the effect of temperature change is very small, and the effect of low noise is outstanding. It has excellent hydrolysis resistance. No matter in cold water or hot water, its mechanical property change is much smaller than that of nylon, polyester, etc., which is basically equivalent to PPO and PPS It can be used in water environment for a long time. Because of its close crystal structure, it has excellent barrier effect on various substances. It is not lipophilic, hydrophilic, and resistant to various chemical solvents. Its barrier performance is basically equivalent to EVOH, and it can form various barrier products by extrusion, injection molding, blow molding and other different processes. After modification, the thermal deformation temperature is 200-215 ℃， and the long-term use temperature can reach 120 ℃ Its performance is better than many engineering plastics in high temperature environment, and its application field is wider; in low temperature, due to the excellent low temperature toughness of the material, it still has good impact resistance under the working condition of - 20-40 ℃； its chemical resistance is extremely excellent, and the C-C bond has chemical stability, except for strong acid and alkali, other chemical environments can be tolerated, and the chemical resistance is basically equivalent to PPS.