Silicone rubber for cement products mold making

Firstly I will talk about condensation type silicone rubber. This kind of silicone contains two parts, one part is base liquid silicone, the other part is the curing agent(tin catalyst). Every time before we need to use the silicone, we must mix up these two parts at the mixing ratio of 2% to 3% if the operation temperature is around the room temperature(25 degree centigrade). It can preliminarily cure with 3-4 hours at room temperature, but you had better put it into production after 24 hours. The shrinkage of this kind of silicone rubber is within 0.3%. This kind of molding silicone is very economical for its lower price.

Secondly let’s know something about addition cure type molding silicone rubber. It also contains two parts, but the mixing ratio is 1:1 or 10:1, and the curing agent is platinum catalyst. This kind of silicone rubber for cement products mold making has lower shrinkage(with 0.1%). When you do the process of cement products mold making, you can elevate the operation temperature to speed up the curing rate. This kind of mold making silicone rubber is completely environmentally friendly and food grade. Moreover, it has a prominent resistance to aging.