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PMC™-121 30/WET

PMC™-121 30/WET vs. Smooth‑Sil™ 936

Easy To Use Urethane Rubber

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Smooth‑Sil™ 936

PMC™-121 30/WET vs. Smooth‑Sil™ 936PMC™-121 30/WET

Lower Viscosity Shore 36A Platinum Silicone

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Key Differences

Product Type
  • Urethane Rubber
  • Silicone Rubber - Platinum Cure
Mixed Viscosity1,800 cps21,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life30 minutes60 minutes
Cure Time16 hours24 hours
ColorClear AmberBlue
Tensile Strength400 psi550 psi
100% Modulus82 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™-121 30/WETSmooth‑Sil™ 936
Product Type
  • Urethane Rubber
  • Silicone Rubber - Platinum Cure
Mixed Viscosity1,800 cps21,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:10B
Pot Life30 minutes60 minutes
Cure Time16 hours24 hours
Shore A Hardness3036
Specific Gravity1.04 g/cc1.21 g/cc
Specific Volume26.7 cu. in./lb.22.9 cu. in./lb.
ColorClear AmberBlue
Die B Tear Strength110 pli
Die C Tear Strength75 pli
Tensile Strength400 psi550 psi
Elongation @ Break1,000 %500 %
100% Modulus82 psi180 psi
Shrinkage< .001 in. / in.<0.001 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F

Product Description

PMC™-121 30/WET

The PMC™-121 Series urethane rubbers feature convenient one-to-one by volume mix ratios. PMC™-121/30 Wet is exceptionally strong and abrasion resistant for soft urethane mold rubbers. It exudes oil that aids in demolding hard plasters and concrete.

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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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