Pok is a new type of engineering plastics with outstanding wear resistance. Its wear resistance is 14 times that of POM, low wear, high dimensional stability in long-term use, very small affected by temperature change, and outstanding low noise effect. It has excellent hydrolysis resistance. No matter in cold water or hot water, its mechanical performance changes much less than nylon and polyester, basically equivalent to PPO and PPS, and can be used in water. It can be used for a long time in the environment. Because of its close crystal structure, it has excellent barrier effect on all kinds of substances. It is not lipophilic, hydrophilic, and resistant to all kinds of chemical solvents. Its barrier performance is basically the same as EVOH, and it can form all kinds of barrier products by extrusion, injection molding, blow molding and other different processes. Its modified thermal deformation temperature is 200-215 ℃， and its long-term use temperature can reach 120 ℃ The properties are better than many engineering plastics in high temperature environment, and the 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, 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.