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Polycraft T-20 Clear RTV Addition Cure Silicone Rubber Shore A 20

Polycraft T-20 Clear RTV Addition Cure Silicone Rubber Shore A 20
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Our Price:  £15.00(Inc. 20% VAT)(£12.50 Exc. VAT)Earn 15 Loyalty Points

Quick Link Code:  8896
Brand:  Polycraft
Polymerization:  Addition Cure

Polycraft T-20 is a two component silicone elastomer that crosslink at room temperature by poly-addition reaction. The polymerisation can be accelerated by heat. The silicone components are delivered as two component low viscous liquids, which once mixed and cured, transforms into a translucent, elastic and resistant material. Polymerisation occurs without formation of heat.

Advantages :

  • Ideal choice for production of orthopaedic devices such as dampening elements.
  • Low viscosity for excellent reproduction of details and easy degassing
  • Easy mix ratios – can use with dispensing machines
  • Cure at room temperature or accelerate with heat
  • Easy release properties –save on release agents
  • High tear strength – fewer prematurely torn moulds
  • Good chemical resistance for longer mould life
  • Low/zero shrinkage for better dimensional reproduction
  • Shore A hardness of 20

Physical Properties :

Mix Ratio


Hardness (Shore A)


Working Time (min)


De-mould Time (at 23°C, min)




Mix Viscosity (mpas)


Elongation at Break (%)


Tear Strength (kN/m)


Tensile Strength (kN/m2) 4

MB Fibreglass believes that the information above is an accurate description of the typical characteristics and/or uses of the product or products, but it is your responsibility to thoroughly test the product in its specific application to determine performance, efficacy and safety.

Inhibition of Cure

Great care must be taken when handling and mixing all addition-cured silicone elastomer systems, that all the mixing tools (vessels and spatulas) are clean and constructed in materials which do not interfere with the curing mechanism, do not use wood and paper mixing utensils. The cure of the rubber can be inhibited by the presence of compounds of nitrogen, sulphur, phosphorus and arsenic; organotin catalysts and PVC stabilisers, epoxy resin catalysts and even contact with materials containing certain of these substances e.g. moulding clays, sulphur vulcanised rubbers, condensation cure silicone rubbers, wood, paper, cardboard, onion and garlic.

Base and catalyst use universal containers for various kit sizes and are supplied by weight, while the supplied containers may not be full, they will contain the correct amount of both base and hardener according to the listing. At point of packaging and dispatch lids may be taped to prevent damage or spillage during transportation.


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