What are the properties of polyurethane rubber?

　　(1) Excellent wear resistance: wear resistance is the highest among all rubbers. Laboratory results show that the wear resistance of UR is 3 to 5 times that of natural rubber, and it is often as high as 10 times in practical applications.

　　(2) High strength and good elasticity in the range of Shore A60 to Shore A70 hardness.

　　(3) The cushioning is good. At room temperature, the UR damping element can absorb 10%~20% of the vibration energy. The higher the vibration frequency, the greater the energy absorption.

　　(4) Good oil resistance and chemical resistance. UR has less affinity with non-polar mineral oils and is hardly eroded in fuel oils (such as kerosene, gasoline) and mechanical oils (such as hydraulic oils, oils, lubricants, etc.), much better than general-purpose rubber. Can be compared with nitrile rubber. The disadvantage is that the swelling property in alcohols, esters, ketones and aromatic hydrocarbons is large.

　　(5) The friction coefficient is relatively high, generally above 0.5.

　　(6) Good resistance to low temperature, ozone, radiation, electrical insulation and bonding.