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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 385 vs. EpoxAcast™ 650 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

Ecoflex™ 5 vs. Smooth-Cast® 385 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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Smooth-Cast® 385

Ecoflex™ 5 vs. Smooth-Cast® 385 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 650 + 102 Hardener

Mineral filled tooling resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps7,000 cps3,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)N/A (gram scale required)
Pot Life1 minute90 minutes20 minutes
Cure Time5 minutes4 hours2 hours
Barcol 935 Hardness93
Shore D Hardness85
Shore A Hardness5
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.17.3 cu. in./lb.
ColorTranslucentOff WhiteBeige
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 HardenerSmooth-Cast® 385
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps7,000 cps3,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:13B1A:5B
Pot Life1 minute90 minutes20 minutes
Cure Time5 minutes4 hours2 hours
Barcol 935 Hardness93
Shore D Hardness85
Shore A Hardness5
Specific Gravity1.07 g/cc1.52 g/cc1.60 g/cc
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.17.3 cu. in./lb.
ColorTranslucentOff WhiteBeige
Die B Tear Strength75 pli
Tensile Strength350 psi3,100 psi
Tensile Modulus1,503,000 psi400,000 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %1 %
100% Modulus15 psi
Compressive Strength16,350 psi8,500 psi
Compressive Modulus142,600 psi400,000 psi
Flexural Strength5,890 psi5,900 psi
Flexural Modulus710,000 psi433,000 psi
Shrinkage<.001 in. / in.0.001 in. / in.0.0006 in. / in.
Heat Deflection Temp129 °F135 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °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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Smooth-Cast® 385

Smooth-Cast® 385 is a mineral filled urethane casting resin that is very hard and durable. When Parts A and B are mixed in proper proportion (1A:5B by weight), Smooth-Cast® 385 cures at room temperature with virtually no shrinkage. This rigid urethane casting resin has high compressive and flexural strength. Fully cured castings are tough, machinable and paintable.

Color effects are possible by adding pigment dispersions. They resist moisture and mild solvents. Smooth-Cast® 385 is ideal for making industrial production parts, foundry patterns, vacuum forming molds, and some ceramic applications

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