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Smooth-Sil™ 940

Smooth-Sil™ 940 Technical Specifications

Addition Cure Silicone Rubber Compounds

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All Technical Data

Smooth-Sil™ 940
Product Type
  • Silicone Rubber - Platinum Cure
Mixed Viscosity35,000 cps
Mix Ratio By Weight100A:10B
Pot Life30 minutes
Cure Time24 hours
Shore A Hardness40
Specific Gravity1.18 g/cc
Specific Volume23.4 cu. in./lb.
Die B Tear Strength100 pli
Tensile Strength600 psi
Elongation @ Break300 %
100% Modulus200 psi
Shrinkage<.001 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F

Product Description

Smooth-Sil™ 940

Smooth-On Smooth-Sil™ Platinum Silicones cure at room temperature with negligible shrinkage. With different hardnesses to choose from, Smooth-Sil™ products offer tremendous versatility and are suitable for making production molds of any configuration, large or small. These silicones exhibit good chemical, abrasion and heat resistance. Materials such as plasters, concrete, wax, low-melt metal alloys or resins (urethane, epoxy or polyester) can then be cast into these silicone rubbers without a release agent.

Smooth-Sil™ Platinum Silicones are used for rapid prototyping, wax casting (foundries and candle makers), architectural restoration and for casting concrete. Smooth-Sil™ 940 is suitable for food related applications. 

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