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Silicone Moulding Rubbers

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Silicone Moulding Rubbers

CHT manufacture RTV silicone moulding rubbers which have easy mix ratios, cure at room temperature and offer fine detailed reproduction.

RTV silicone rubbers use two different types of silicone chemistry to form an elastomer: condensation cure systems, which use a tin based catalyst, and addition cure systems, which use platinum based catalyst. Although the end products can be very similar they do have some key differences which should always be considered when making your product selection. Click on the orange header for more information.

High Tear Silicone Condensation Cure Range

  • Well suited to fine details and extensive undercuts
  • Durable
  • Excellent release (no need for release agents)

Low Tear Silicone Condensation Cure Range

  • Lower costs
  • Suitable for less intricate work

Addition Cure Moulding Rubbers

  • High tear
  • Very low shrinkage
  • Ideal for reproducing masters
  • Can be heat accelerated

Food Grade Moulding Rubbers

  • Thoroughly tested by an independent laboratory and certified to meet FDA CFR 177.2600, EC 1935/2004 and EU 10/2011
  • For use with various foods including chocolate, confectionery & icing sugar
  • High tensile & tear strength

Gelflex

  • Reusable vinyl moulding rubber
  • Two grades - hard & soft

Silicone Skin Rubber

  • Soft colourless rubber which is easily pigmented
  • Suitable for skin replicatrion in prosthetics & for the production of special effects

Silicone for Vacuum Bags

  • 1:1 mix sprayable material
  • Fast addition cure
  • High tear & tensile strength

Thixotroping Agent

  • Specially formulated thixotroping agent for use with the 900 Series condensation cure RTV moulding rubbers
  • Enables moulding rubbers to be applied to a vertical surface

For further information download our Moulding Rubbers brochure and product chart.

 

Addition Cure vs Condensation Cure

The differences between the two systems should not be referred to in terms of positives and negatives but rather properties that will provide benefits for different applications.

Key differences:

Addition Cure

  • Low shrinkage - below 0.1%
  • Marginally higher tensile strength
  • Slightly tougher rubber
  • Needs to carefully and accurately mixed
  • Platinum catalyst can be poisoned (*see note below)
  • Good abrasion resistance
  • Can be accelerated using heat
  • Tolerant to the addition of silicone fluid as a softener

Condensation Cure

  • Lower costs
  • Broader product range
  • Less sensitive to exact mix ratio
  • Easy to use thixotroping agent available
  • Accelerator catalysts available to speed up cure
  • Mixing of grades possible to achieve desired hardness

Where the application demands good dimensional stability, e.g. precision moulding, prototyping, making masters or very large objects, then addition cure would be the preferred choice. However, the shrinkage levels for a good condensation cure are still very low at about 0.5%. The reproduction and release properties of both materials are excellent as is the transfer of very fine detail.


Moulding Rubber Applications:

CHT have a wide range of moulding rubber products which can be used for a variety of applications including food grade products for use with chocolate, icing sugar and other confectionery and skin rubber for using to create prosthetics or for use in special effects for films & theatre. Both high and low tear products are available.CHT moulding rubbers are also ideal for creating tampo print pads for printing on ceramics, plastics and metals.

For further information about applications visit our Mould Making applications page or download our RTV Moulding Rubber or Tampo Pad Printing application guides.

    • Food grade
    • Silicone skin rubber
    • High tear
    • Low tear
    • Gelflex moulding rubber
    • Tampo printing

Product Listing

Code Description Request Sample TDS SDS
Gelflex HG Blue Remeltable PVC compound for moulding
Gelflex SG Natural Remeltable PVC compound for moulding
MM228 10:1 addition cure silicone moulding rubber
MM240TV 10:1 addition cure silicone moulding rubber
MM4400 Condensation cure paste high tear
MM50T 2 Part Condensation Cure Moulding Rubber
MM709 Condensation Cure Moulding Rubber base
MM730FG 10:1 Addition cure silicone moulding rubber food grade 30 Shore A
MM810 Condensation cure silicone moulding rubber 11 Shore A low tear
MM816 Condensation cure silicone moulding rubber 16 Shore A low tear
MM820 Condensation cure silicone moulding rubber 20 Shore A low tear
MM828 Condensation cure silicone moulding rubber 28 Shore A low tear
MM830 Condensation cure silicone moulding rubber 27 Shore A low tear
MM850 Condensation cure silicone moulding rubber 55 Shore A low tear
MM903 Condensation cure silicone moulding rubber 3 Shore A high tear
MM906 Condensation cure silicone moulding rubber 6 Shore A high tear
MM911 Condensation cure silicone moulding rubber 11 Shore A high tear
MM913 Condensation cure silicone moulding rubber 13 Shore A high tear
MM918 Condensation cure silicone moulding rubber 18 Shore A high tear
MM922 Condensation cure silicone moulding rubber 22 Shore A high tear
MM928 Condensation Cure Silicone Moulding Rubber 27 Shore A high tear
MM940 Condensation cure silicone moulding rubber 37 Shore A high tear
QM260 2 Part addition cure silicone moulding rubber
QM270 2-Part addition cure silicone moulding rubber
VBS26-35 2 Part Addition cure silicone moulding rubber