RTV Silicone Moulding Rubber 5.15kg kit


5kg Silicone + 150g Catalyst

 Total Volume 4.76 Litres

The cure time can be adjusted by varying the amount of catalyst
A ratio 0f 4% catalyst (4g catalyst per 100g rubber) = Pot life 4-6 minutes - Cure time 1.5 hours
A ratio 0f 3% catalyst (3g catalyst per 100g rubber) = Pot life 15-20 minutes - Cure time 3hours
A ratio 0f 2% catalyst (2g catalyst per 100g rubber) = Pot life 25-30 minutes - Cure time 7 hours

*Supplied with 3% worth of catalyst*

Newly formulated to be of the highest quality comparable to other leading brands.

The catalyst has been formulated to pose minimal risk to the user and is non-toxic, non-flammable and virtually odourless unlike the majority of other condensation cure silicones on the market.
The two components mix easily by hand and because of the low viscosity can be used without processing in a vacuum chamber. The cured rubber is a flexible, elastic material with exceptional tensional and tear strength. It has a long mould life, almost no shrinkage (0.2%) and excellent reproduction of fine detail. Supplied with a purple catalyst which provides a visual aid to ensure that the material is thoroughly mixed. A clear catalyst is available on request.

Physical Properties Medium Version Soft Version
Viscosity mPas 18,000 11,000
Tensile Strength Mpa 4.5 4
Elongation 420% 500%
Tear Strength kN/m 28 25
0.2% 0.2%


This silicone is suited for the detailed reproduction of figures, art objects, soaps, candles and similar items.

  • Can be pigmented to a wide range of colours 
  • It can be softened to your own requirements using this softening additive  
  • Can be made thixotropic for applying to vertical surfaces or to over head objects 
  • Outstanding release properties
  • Variable pot life and cure time
  • Flexible, elastic material with High tear resistance
  • High tensile strength
  • Good polyester resistance
  • No risk of the casting material gripping the mould surface


  • Polyurethane resin
  • Epoxy resin
  • Polyester resin
  • Acrylic resin
  • Plaster
  • Cement  
  • Polymer Clays
  • Waxes

Not suitable for use with food , on human skin or for casting hot metals. Please view my other products which are suitable for these applications.

All prices include VAT unless otherwise stated.

DWR Plastics - Silicone Moulding Kits, Rubbers & Resins