Among all the rubbers, silicone rubber has the widest working temperature range (-100-350 C). For example, vinyl silicone rubber or low-phenyl silicone rubber can remain elastic after aging in hot air at 250 C for thousands of hours or 300 C for hundreds of hours; low-phenyl silicone rubber vulcanizate can remain elastic after aging in hot air at 350 C for tens of hours, its glass transition temperature is - 140 C, and its vulcanizate is between - 70 and 100 C. It is still elastic at temperature. Silicone rubber can withstand thousands of degrees of high temperature instantaneously when it is used as thermal protection coating on the inner wall of rocket nozzle.