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Ecoflex™ 5

Smooth-Sil™ 950 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Sil™ 950

Smooth-Sil™ 950 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Addition Cure Silicone Rubber Compounds

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps100 cps35,000 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes45 minutes
Cure Time5 minutes15 minutes18 hours
Shore D Hardness80
Shore A Hardness550
ColorTranslucentBlackBlue
Tensile Strength350 psi5,840 psi725 psi
Elongation @ Break1,000 %4 %320 %
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™ FASTSmooth-Sil™ 950
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps100 cps35,000 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B100A:10B
Pot Life1 minute2.5 minutes45 minutes
Cure Time5 minutes15 minutes18 hours
Shore D Hardness80
Shore A Hardness550
Specific Gravity1.07 g/cc1.09 g/cc1.24 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.22.3 cu. in./lb.
ColorTranslucentBlackBlue
Die B Tear Strength75 pli155 pli
Tensile Strength350 psi5,840 psi725 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %320 %
100% Modulus15 psi272 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-65 °F
Useful Temperature (max)450 °F450 °F
Heat Deflection With Post Cure250 °F
Thermal Conductivity0.261 W/M*K

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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Smooth-Sil™ 950

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™ 950 is suitable for food related applications. 

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