The molecular weight and molecular weight distribution, raw vinyl content, and vinyl side chain distribution of silicone rubber raw rubber polymers are closely related to the process performance and use performance of silicone rubber. Generally used for the compounding of silicone rubber products for processing small and fine silicon rubber products. To emphasize processing properties such as rubber fluidity, raw rubber with a moderate molecular weight should be selected. For high mechanical properties, especially high vulcanizate tear strength Compound rubber, you need to choose a high molecular weight terminal vinyl silicone rubber raw rubber, and the raw rubber polymer side chain vinyl is best distributed properly; the compound rubber for long-life silicone rubber key processing Compression set and fatigue life of rubber are important performance indicators. Raw rubber with a relatively narrow molecular weight distribution should be selected. Raw rubber used for conductive silicone rubber processing requires special control of the volatile content of raw rubber.