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PMC™-790

PMC™-790 vs. Smooth‑Sil™ 936

Industrial Liquid Rubber Compound

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Smooth‑Sil™ 936

PMC™-790 vs. Smooth‑Sil™ 936PMC™-790

Lower Viscosity Shore 36A Platinum Silicone

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Key Differences

Product Type
  • Urethane Rubber
  • Silicone Rubber - Platinum Cure
Mixed Viscosity3,000 cps21,000 cps
Mix Ratio By Volume2A:1BN/A (gram scale required)
Pot Life20 minutes60 minutes
Cure Time48 hours24 hours
Shore A Hardness9036
ColorClear AmberBlue
Tensile Strength2,000 psi550 psi
100% Modulus640 psi180 psi
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

PMC™-790Smooth‑Sil™ 936
Product Type
  • Urethane Rubber
  • Silicone Rubber - Platinum Cure
Mixed Viscosity3,000 cps21,000 cps
Mix Ratio By Volume2A:1B
Mix Ratio By Weight2A:1B100A:10B
Pot Life20 minutes60 minutes
Cure Time48 hours24 hours
Shore A Hardness9036
Specific Gravity1.07 g/cc1.21 g/cc
Specific Volume25.9 cu. in./lb.22.9 cu. in./lb.
ColorClear AmberBlue
Die B Tear Strength110 pli
Die C Tear Strength300 pli
Tensile Strength2,000 psi550 psi
Elongation @ Break550 %500 %
100% Modulus640 psi180 psi
Shrinkage<.001 in. / in.<0.001 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F

Product Description

PMC™-790

PMC™-790 is a Shore 90A industrial urethane rubber compound designed to meet the most stringent requirements of industrial production applications. It is a very hard rubber that offers superior tear and tensile strength as well as impact and abrasion resistance. 

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Smooth‑Sil™ 936

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™ 936 is a lower viscosity platinum silicone rubber (21,000 cps).  It is easier to mix, vacuum degas and pour. Smooth-Sil™ Platinum Silicones are used for rapid prototyping, wax casting (foundries and candle makers), architectural restoration and for casting concrete.

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