Mold silicone rubber is generally composed of basic rubber, crosslinking agent, catalyst, filler, etc.

(1) The base rubber, 107 silicone rubber, is called hydroxyl terminated polydimethylsiloxane. The die silicone rubber can be cured at room temperature, has good fluidity, no deformation and only slight linear shrinkage.

(2) The crosslinking agent is tetraethyl orthosilicate. The amount of crosslinking agent has an obvious effect on the curing time, tear strength and elongation of silicone rubber. Practice shows that the appropriate amount of crosslinking agent is 5% (mass fraction) of the base rubber.

(3) The catalyst is dibutyltin dilaurate. The amount of catalyst added is directly related to the curing time, which should not be too much, generally 1% - 2% (mass fraction).

(4) Fillers include talc powder, quartz powder and silica. Talc powder is generally used as filler. When silica is used as filler, the mechanical strength, tear strength and uniformity are significantly improved.