The pre vulcanized silicone rubber is called raw silicone. The molecular cohesive energy density of raw silicone is low, and the molecular chains are prone to slip. After direct vulcanization, tensile strength, soft hardness, and tear strength cannot meet the needs of production conditions. For example, the added liquid silicone rubber without reinforcing agents has poor strength, with a tensile strength of only 0 3 MPa, can be increased to at least 0 after addition 65 MPa.

The commonly used fillers in liquid silicone rubber are divided into two types: one is reinforcing fillers, such as silica and calcium carbonate, which are mainly used in industrial and medical silicone rubber materials to improve the comprehensive performance of silicone rubber. Silicon dioxide is the most commonly used filler in liquid silicone rubber, which can improve the mechanical properties of liquid silicone rubber. Gaseous silica has low pathogenicity and is a commonly used filler for medical silicone rubber materials. Another type is compatibilizer fillers, such as montmorillonite, which have the effect of improving the conductivity of blends.

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