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Australia's Leading Supplier of Moulding and Casting Materials

What are RTV silicone rubbers?

rtv silicone rubberRTV silicone rubbers are pourable, spreadable or kneadable compounds, which will crosslink in the presence of a second component to form flexible rubbers. They are outstanding as mould-making materials because of their excellent properties:

• Easy to use

• Excellent release properties

• Accurate reproduction of surface details

• Good heat resistance

• Little or no shrinkage


RTV silicone rubbers can also be used for encapsulation and sealing, or for making flexible parts. RTV silicone rubbers always consist of two components, namely the rubber base itself and a catalyst, or the components A and B. They are cured or vulcanised at room temperature (RTV= room temperature vulcanising).


Different grades are available, with different properties suitable for a wide range of applications. They can be classified according to the following criteria:

1. Vulcanising system (condensation-curing or addition-curing)

2. Consistency (pourable, spreadable or kneadable)

3. Mechanical properties of the cured rubbers (e.g. tear resistance and elasticity)