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Ecoflex™ 5

EpoxAcast™ 690 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 690

EpoxAcast™ 690 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Optically Clear Casting Epoxy

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Casting and Laminating Resins
Mixed Viscosity13,000 cps100 cps280 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes5 hours
Cure Time5 minutes15 minutes24 hours
Shore D Hardness8080
Shore A Hardness5
ColorTranslucentBlackClear
Tensile Strength350 psi5,840 psi6,630 psi
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™ FASTEpoxAcast™ 690
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Casting and Laminating Resins
Mixed Viscosity13,000 cps100 cps280 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B100A:30B
Pot Life1 minute2.5 minutes5 hours
Cure Time5 minutes15 minutes24 hours
Shore D Hardness8080
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.10 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.25 cu. in./lb.
ColorTranslucentBlackClear
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi6,630 psi
Tensile Modulus246,000 psi572,000 psi
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi9,610 psi
Compressive Modulus77,400 psi91,300 psi
Flexural Strength8,280 psi10,980 psi
Flexural Modulus246,000 psi410,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.002 in. / in.
Heat Deflection Temp115 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
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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EpoxAcast™ 690

EpoxAcast™ 690 is a clear casting epoxy resin suitable for a variety of industrial and art-related projects requiring a rigid, clear finished casting. It is mixed 100A:30B by weight (gram scale required) and features a very low viscosity for easy mixing and minimal bubble entrapment. Working time is 5 hours and cure time is 24 hours at room temperature. Castings cure with negligible shrinkage and are very hard and strong. Resin can be colored with UVO™ or IGNITE™ colorants. This product is not moisture sensitive and can be used in humid environments. Recommended casting thickness maximum per layer is 3/8 in. / 0.95 cm.

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