Condensation Cure Silicone Rubber is a low viscosity, two-part condensation cure silicone rubber. It is used for mould making where it is mixed with its catalyst and then poured around a pattern to create a flexible silicone mould. Cures in 24 hours. Once cured the silicone rubber is very soft and flexible making it perfect for casting complicated or intricate shapes where the cast part can be easily removed from the silicone mould. The long pot-life of the silicone allows plenty of time for careful pouring and self de-gassing.