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Smooth‑Sil™ 940

Free Form™ AIR vs. Smooth‑Sil™ 940Free Form™ AIR

Addition Cure Silicone Rubber Compounds

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Key Differences

Product Type
  • Epoxy Putties
  • Silicone Rubber - Platinum Cure
Mixed ViscosityDough35,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Shore D Hardness50
Shore A Hardness40
Specific Volume61.6 cu. in./lb.23.4 cu. in./lb.
ColorGreyPink
Disclaimer
Although we do our best to ensure accuracy, Smooth-On offers no warranties, promises, and/or representations of any kind, either expressed or implied, as to the accuracy, completeness, or reliability of the information contained on this Compare Tool, nor suitability of the information contained herein to your particular circumstances. Smooth-On assumes no liability for losses or damages of whatever nature (direct, indirect, consequential or other) associated with your use, or inability to use, the Compare Tool, or from your use (or failure to use) the information contained herein. Other useful tools include product technical bulletins and our extensive FAQ section. You can also contact our technical support team.

All Technical Data

Free Form™ AIRSmooth‑Sil™ 940
Product Type
  • Epoxy Putties
  • Silicone Rubber - Platinum Cure
Mixed ViscosityDough35,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:10B
Pot Life30 minutes
Cure Time24 hours
Shore D Hardness50
Shore A Hardness40
Specific Gravity0.45 g/cc1.18 g/cc
Specific Volume61.6 cu. in./lb.23.4 cu. in./lb.
ColorGreyPink
Die B Tear Strength100 pli
Tensile Strength600 psi
Elongation @ Break300 %
100% Modulus200 psi
Shrinkage<.001 in. / in.
Heat Deflection Temp140 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Buoyant Force10.4 lb/ft³

Product Description

Free Form™ AIR

Free Form™AIR is an extremely lightweight epoxy putty suitable for an infinite variety of industrial and art-related applications. This is a low-odor, low shrinkage putty that is unique, inexpensive and easy to use. Free Form™AIR is mixed by hand with a 1A:1B by volume or weight mix ratio. It offers a long working time and cures overnight at room temperature to a hard, rigid epoxy that is very strong. Cured Free Form™AIR is so lightweight, it will float in water. It can be sanded, shaped, and drilled. It will readily accept any paint. Free Form can also be color pigmented with UVO™ or Ignite™ colorants.

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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. 

Click here for more Smooth-Sil™ silicone products.

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