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Smooth‑Sil™ 936

VytaFlex™ 50 vs. Smooth‑Sil™ 936

Lower Viscosity Shore 36A Platinum Silicone

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VytaFlex™ 50

VytaFlex™ 50 vs. Smooth‑Sil™ 936Smooth‑Sil™ 936

Urethane Mold Rubber For Perfect Concrete Castings

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Rubber
Mixed Viscosity21,000 cps2,000 cps
Mix Ratio By VolumeN/A (gram scale required)1A:1B
Cure Time24 hours16 hours
Shore A Hardness3650
ColorBlueOff-White
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

Smooth‑Sil™ 936VytaFlex™ 50
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Rubber
Mixed Viscosity21,000 cps2,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight100A:10B1A:1B
Pot Life60 minutes60 minutes
Cure Time24 hours16 hours
Shore A Hardness3650
Specific Gravity1.21 g/cc1.04 g/cc
Specific Volume22.9 cu. in./lb.26.7 cu. in./lb.
ColorBlueOff-White
Die B Tear Strength110 pli
Die C Tear Strength102 pli
Tensile Strength550 psi588 psi
Elongation @ Break500 %400 %
100% Modulus180 psi215 psi
Shrinkage<0.001 in. / in.<.001 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F

Product Description

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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VytaFlex™ 50

Using Smooth-On’s exclusive “V-Polymer™” technology, VytaFlex™ urethane rubbers offer superior physical and performance properties for casting concrete. VytaFlex™ urethanes are available in 10A, 20A, 30A, 40A,  45A, 50A and 60A Shore hardness’s and feature convenient one-to-one by volume mix ratios.

Vacuum degassing is not necessary and VytaFlex™ rubbers cure with negligible shrinkage to a durable rubber that will last in production.

VytaFlex™ mold rubbers work especially well for casting pigmented / colored concrete. Molds made with VytaFlex™ Series urethanes will render accurate and uniform colored castings.

FOR COMMERCIAL/INDUSTRIAL USE ONLY

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