Our RTV-2 silicone products are separated into two categories - Condensation Cure (tin-catalyzed) and Addition Cure (platinum-catalyzed). Both systems are composed of two parts that are combined to begin the curing process. We identify the tin-catalyzed products as the GI Series and the platinum-catalyzed products as the P Series.
Both chemistries have unique characteristics that makes each a suitable choice depending on the circumstances. For instance, if high temperatures are anticipated, addition cure silicones (P-Series) are typically a better choice. For economy, general mold making and prototype applications, condensation cure (GI-Series) may be preferable.
GI-Series (Tin Catalyzed)
Condensation cure two-component silicone rubbers are excellent for most general mold making and prototype applications. The GI rubbers are not sensitive to inhibition, meaning they will cure at room temperature over virtually any surface. They are easy to mix and de-air, and they cure with only a slight degree of shrinkage. The speed at which the rubber hardens can be accelerated with special activators. Finished GI silicone molds are excellent for casting polyester, epoxy, polyurethane, masonry, gypsum and candle wax.
P-Series (Platinum Catalyzed)
Addition cure two-component silicone rubbers offer superior heat resistance and cure with virtually no shrinkage. Although the P rubbers can be inhibited by tin, sulphur or amines, they can be cured in total confinement and the cure rate can be dramatically accelerated with heat. Finished P silicone molds are ideal for casting epoxies, low melting-point metals and polyurethanes.
