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Ecoflex™ 5

Rubber Glass™ vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Rubber Glass™

Rubber Glass™ vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

For Flexible Fake Glass & Ice Effects

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps100 cps150 cps
Pot Life1 minute2.5 minutes120 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness80
Shore A Hardness533
ColorTranslucentBlackClear
Disclaimer
Although we do our best to ensure the accuracy of this Compare Tool, Smooth-On offers no warranty either expressed or implied as to the reliability of the information contained herein. Smooth-On assumes no liability for loss or damage associated with use of the Compare Tool. If this is a critical project, we encourage you to review all of the technical data below and contact our Technical Service department with any questions or concerns.

All Technical Data

Ecoflex™ 5Smooth-Cast® ONYX™ FASTRubber Glass™
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps100 cps150 cps
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B1A:1B
Pot Life1 minute2.5 minutes120 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness80
Shore A Hardness533
Specific Gravity1.07 g/cc1.09 g/cc0.97 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.28.6 cu. in./lb.
ColorTranslucentBlackClear
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi
Compressive Modulus77,400 psi
Flexural Strength8,280 psi
Flexural Modulus246,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.<.001 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Dielectric Constant, 100Hz3.17
Dielectric Strength319 volts/mil
Heat Deflection With Post Cure250 °F

Product Description

Ecoflex™ 5

Ecoflex™ rubbers are platinum-catalyzed silicones that are versatile and easy to use. Ecoflex™ rubbers are mixed 1A:1B by weight or volume and cured at room temperature with negligible shrinkage.  Low viscosity ensures easy mixing and de-airing. Dispense using our convenient dispensing cartridges. Cured rubber is very soft, very strong and very “stretchy”, stretching many times its original size without tearing and will rebound to its original form without distortion.

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Smooth-Cast® ONYX™ FAST

Smooth-Cast® ONYX™ is a mercury-free urethane resin that cures at room temperature to a deep black, solid plastic. ONYX™ resins offer the convenience of a 1A:1B by volume mix ratio and have very low viscosities, so they are easy to mix and pour. ONYX™ resins have an ultimate Shore hardness of 80D and offer higher physical properties and higher heat resistance vs. other general purpose resins.ONYX™ FAST resin has a pot life of 2.5 minutes and a cure time of 10-15 minutes. ONYX™ FAST is a good choice for creating fast cold cast bronze, brass, copper, nickel/silver, etc. effects.

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Rubber Glass™

Rubber Glass™ is a platinum-catalyzed silicone rubber product developed specifically for special effects and display applications. Two liquids (1 Part A + 1 Part B) are mixed together and poured into a container.

The mixture cures overnight to a solid water clear rubber that can then be easily broken or “crumbled” into pieces that look exactly like broken glass, ice or diamonds. Vibrant colors are possible by adding Silc-Pig™ liquid color pigments.

Rubber Glass™ can be used to create a variety of special effects (i.e. simulated broken glass where human contact is required) and model effects (i.e. simulated ice or water). It can also be used for electronic encapsulation applications.

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