RTV Silicone Base

SKU: SIL0001

Size: 1kg
Sale price$20.00


 This product requires a catalyst! Please see our RTV Silicone Catalyst (3%).

RTV Silicone is a high strength RTV silicone moulding compound ideal for moulds for plaster and Jesmonite and most other modelmaking applications. Moulds made from RTV Silicone will give high quality reproduction with virtually no shrinkage and with excellent release properties. RTV Silicone has been designed to be easy to mix by hand with colour-coded catalyst to offer a visual aid to ensure mixing is complete.

The two components mix easily and because of its low viscosity RTV Silicone can be used without the use of a vacuum chamber. RTV Silicone also can be thickened with Silastic Thixo Additive to enable you to make skin moulds and to mould in-situ on site.

Features & Benefits

As a guide, the yield (or coverage) of 1kg Silicone is 1290 cm2 at 6mm deep." 

  • High flowability and long working time
  • Medium hardness
  • High tear resistance
  • High elasticity, for easy removal of, complex replica parts
  • Can be made thixotropic (nonflowable) for vertical surface replication
  • Choice of catalyst for all applications

The Catalyst for RTV Silicone Base is pigmented green for easy visual mixing assessment. Fast is supplied as standard.

Added to RTV Silicone Base at 3%.

  • 1kg Silicone Base requires 30g Catalyst
  • 5kg Silicone Base requires 150g Catalyst
  • 25kg Silicone Base requires 750g Catalyst

RTV Catalyst is available in 3 speeds;


Working Time

Cure Time


30 minutes

5-7 hours


90 minutes

24 hours


10 minutes

3 hours


As a guide, the yield (or coverage) of 1kg Silicone is 1290 cm2 at 6mm deep.

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