Mould silicone rubber, generally by the base rubber, crosslinking agent, catalyst, filler and so on.


(1) The base glue, 107 silicone rubber, known as hydroxy-terminated polydimethylsiloxane. This mold silicone rubber can be cured at room temperature, has good fluidity, no deformation, only small linear shrinkage.


(2) Crosslinking agent, ethyl orthosilicate. The amount of crosslinking agent has obvious influence on the curing time, tearing strength and elongation of silicone rubber. Practice has proved that the appropriate amount of crosslinking agent is 5% (mass fraction) of the base glue.


(3) catalyst, dibutyltin dilaurate. The amount of catalyst added has a direct relationship with the curing time, which should not be too much, generally 1%-2% (mass fraction).


(4) packing, talc powder, quartz powder, white carbon black. Generally, talc powder is used as filler. If white carbon black is used as filler, the mechanical strength, tearing strength and uniformity are significantly improved.