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Ecoflex™ 5

Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener vs. Free Form™ AIR HT

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener vs. Free Form™ AIR HTEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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Free Form™ AIR HT

Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener vs. Free Form™ AIR HTEcoflex™ 5 versus EpoxAcast™ 650 + 102 Hardener

High Temperature Epoxy Dough

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Epoxy Putties
Mixed Viscosity13,000 cps7,000 cpsDough
Mix Ratio By Volume1A:1BN/A (gram scale required)2A:1B
Pot Life1 minute90 minutes150 minutes
Cure Time5 minutes4 hours16 hours
Barcol 935 Hardness93
Shore D Hardness55
Shore A Hardness5
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.54.31 cu. in./lb.
ColorTranslucentOff WhiteGrey
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™ 650 + 102 HardenerFree Form™ AIR HT
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Epoxy Putties
Mixed Viscosity13,000 cps7,000 cpsDough
Mix Ratio By Volume1A:1B2A:1B
Mix Ratio By Weight1A:1B100A:13B2A:1B
Pot Life1 minute90 minutes150 minutes
Cure Time5 minutes4 hours16 hours
Barcol 935 Hardness93
Shore D Hardness55
Shore A Hardness5
Specific Gravity1.07 g/cc1.52 g/cc0.51 g/cc
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.54.31 cu. in./lb.
ColorTranslucentOff WhiteGrey
Die B Tear Strength75 pli
Tensile Strength350 psi
Tensile Modulus1,503,000 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %
100% Modulus15 psi
Compressive Strength16,350 psi
Compressive Modulus142,600 psi
Flexural Strength5,890 psi
Flexural Modulus710,000 psi
Shrinkage<.001 in. / in.0.001 in. / in.
Heat Deflection Temp129 °F300 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Heat Deflection With Post Cure400 °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™ 650 + 102 Hardener

EpoxAcast™ 650 is a mineral filled general purpose casting epoxy that is low cost and versatile. It features a low mixed viscosity for minimal bubble entrapment.

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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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