Room temperature vulcanization (RTV) silicone rubber is divided into two categories in terms of product morphology: single component (RTV-1) and two-component (RTV-2). In terms of vulcanization mechanism, it can be divided into two systems: condensation type and addition forming. All kinds of room temperature vulcanized silicone rubber need to be reinforced with fillers to have value. At present, fumed silica is the most used and most effective RTV silicone rubber reinforcing filler. Because RTV silicone rubber is generally used as pouring, caulking, coating and other sealing materials, in order to maintain the viscosity and fluidity before vulcanization, the amount of fumed silica is generally less than that of high temperature vulcanized silicone rubber, and is often used with other reinforcing and semi-reinforcing fillers to facilitate construction operations.

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