7. ethyl silicone rubber

In the polysiloxane side chain by introducing ethyl diethyl silicone rubber, its outstanding performance is particularly good cold resistance, cold resistance is better than the dimethyl silicone rubber and general methyl vinyl silicone rubber. The higher the ethyl content, the better the cold resistance. However, ethyl is more reactive than methyl, so the heat resistance decreases with the increase of ethyl content. As the ethyl silicone rubber used at low temperature, the polymer containing diethyl silicon oxygen chain is suitable for 8 grams of molecular %. The service temperature of ethyl silicone rubber is generally -70- 200℃.

8.Silicon nitrogen rubber

The main advantage of silicon nitrogen rubber is that it has excellent thermal stability, does not decompose in 430 ~ 480℃, and some can even withstand the high temperature of more than 500℃. The outstanding weakness of silicon nitrogen rubber is poor hydrolysis stability, which was once considered as no development prospect. Later it was found that the polymer with cyclodisilazane in the main chain had good thermal stability. The elastomer containing cyclodisilazane modified by silane has no weight loss when heated to 425℃ in air, and only 10% weight loss when heated to 570℃, and has good hydrolysis stability.