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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps100 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)100A:100B
Pot Life1 minute75 minutes2.5 minutes
Cure Time5 minutes9 hours15 minutes
Shore D Hardness9080
Shore A Hardness5
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.27.7 cu. in./lb.
ColorTranslucentGreyBlack
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™ 5EpoxAcast™ 655 + 102 HardenerSmooth-Cast® ONYX™ FAST
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps100 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B100A:11B120A:100B
Pot Life1 minute75 minutes2.5 minutes
Cure Time5 minutes9 hours15 minutes
Shore D Hardness9080
Shore A Hardness5
Specific Gravity1.07 g/cc1.66 g/cc1.09 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.27.7 cu. in./lb.
ColorTranslucentGreyBlack
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus2,040,000 psi246,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength12,500 psi8,760 psi
Compressive Modulus125,500 psi77,400 psi
Flexural Strength7,660 psi8,280 psi
Flexural Modulus1,403,000 psi246,000 psi
Shrinkage<.001 in. / in.0.0006 in. / in.0.010 in. / in.
Heat Deflection Temp135 °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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EpoxAcast™ 655 + 102 Hardener

EpoxAcast655 (formerly Metalset™ A-30) is a versatile aluminum filled castable epoxy that is very hard and strong. It is dimensionally stable, even when mass cast up to 512 in3 / 8,390 cm3.

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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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