Vi. phenylene silicone rubber
The main characteristic of phenylene silicone rubber is its excellent radiation resistance. Its radiation resistance is 10-15 times of that of general methyl vinyl silicone rubber and 5-10 times of that of high phenyl silicone rubber. Therefore, it can be used in aerospace industry, atomic energy industry and nuclear reactor as cables, sheaths, washers and heat shrinkable tubes resistant to high energy radiation.

VII. Ethyl silicone rubber
Diethyl silicone rubber is made by introducing ethyl into the side chain of polysiloxane. Its outstanding performance is excellent cold resistance, which is better than that of dimethyl silicone rubber and general methyl vinyl silicone rubber. The higher the ethyl content, the better the cold resistance. However, the reactivity of ethyl is higher than that of methyl, so the higher the content of ethyl, the lower the heat resistance. As a kind of ethyl silicone rubber used at low temperature, it is suitable to contain 8g molecular% diethylsiloxane in the polymer. The use temperature of ethyl silicone rubber is generally - 70-200 ℃.

VIII.Silicon nitrogen rubber
The main advantage of silastic nitrogen rubber is that it has excellent thermal stability, does not decompose at 430-480 ℃, and some can even withstand high temperature above 500 ℃. The prominent weakness of silastic nitrogen rubber is poor hydrolysis stability, which was once considered to have no future. It was found that the polymer with CYCLODISILAZANE in the main chain had good thermal stability. The elastomer containing CYCLODISILAZANE modified by silaryl is weightless when heated to 425 ℃ in air, and only 10% when heated to 570 ℃, and has good hydrolysis stability.