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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Free Form™ AIR HT

Super-Soft, Addition Cure Silicone Rubber

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Free Form™ AIR HT

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Free Form™ AIR HTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

High Temperature Epoxy Dough

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Putties
Mixed Viscosity13,000 cps100 cpsDough
Pot Life1 minute2.5 minutes150 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness8055
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.54.31 cu. in./lb.
ColorTranslucentBlackGrey
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™ FASTFree Form™ AIR HT
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Putties
Mixed Viscosity13,000 cps100 cpsDough
Mix Ratio By Volume1A:1B100A:100B2A:1B
Mix Ratio By Weight1A:1B120A:100B2A:1B
Pot Life1 minute2.5 minutes150 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness8055
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc0.51 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.54.31 cu. in./lb.
ColorTranslucentBlackGrey
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.
Heat Deflection Temp300 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Heat Deflection With Post Cure250 °F400 °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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Free Form™ AIR HT

Free Form™ AIR HT is a low density, lightweight epoxy putty that offers high temperature resistance to 300°F/149°C when cured at room temperature and 400°F/204°C when heat post cured. This is a low-odor, low shrinkage formula that is easy to use. Free Form™ AIR HT is mixed by hand with a 2A:1B by volume or weight mix ratio. It offers a long working time and cures overnight at room temperature to a hard, rigid epoxy that is very strong with modeling board-like properties. It can be sanded, shaped, drilled, tapped and CNC machined/routered.

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