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Silicone Mouldmaking Rubber

Addition and Condensation cured rubbers for making moulds

Silicone Mould making rubbers have been in use as a mould making material for many years. These Silicone Rubber Materials have natural properties which make them ideally suited for use as a moulding medium for part reproduction as well as use for products in their own right.


General Features of Silicone Rubber

  • Fine detailed reproduction of most surfaces
  • Excellent self release properties (use of release agents not normally required)
  • Durable
  • Good tear strength and elongation
  • Low shrinkage
  • Easy and Simple to use

There are 2 different types of silicone rubbers:

  1. Addition cure systems which use platinum based catalyst.
  2. Condensation cure systems which use a tin based catalyst Silicone Rubbers cured with either system have very similar properties but there are some differences which should be considered when using or making moulds from either type of Silicone Rubber.

Silicone rubber key differences:

Addition Cure Silicone (Platinum Based) POLYMECH PROTO Series

  • Low shrinkage, below 0.1%
  • Marginally higher tensile strength
  • Slightly tougher rubber
  • Need for careful and accurate mixing
  • Platinum catalyst can be chemically contaminated *
  • Good abrasion resistance
  • Can be accelerated using heat
  • Tolerant to the addition of silicone fluid as a softener



Condensation Cure Silicone (Tin Based) POLYMOULD Series

  • Lower costs
  • Wider range of properties available
  • Less sensitive to mix ratio errors
  • Easy to use with thixotropic agents to produce a brushable silicone rubber product.
  • Cannot be Heat Accelerated to speed up cure
  • Fast catalysts available to speed up cure
  • Mixing of grades possible to achieve desired hardness