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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 322 vs. EpoxAcast™ 650 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

Ecoflex™ 5 vs. Smooth-Cast® 322 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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Smooth-Cast® 322

Ecoflex™ 5 vs. Smooth-Cast® 322 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 650 + 102 Hardener

Off-White, Ultra Low Viscosity Liquid Plastics

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps7,000 cps80 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute90 minutes20 minutes
Cure Time5 minutes4 hours4 hours
Barcol 935 Hardness93
Shore D Hardness70
Shore A Hardness5
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentOff WhiteOff White
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® 322
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps7,000 cps80 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:13B100A:90B
Pot Life1 minute90 minutes20 minutes
Cure Time5 minutes4 hours4 hours
Barcol 935 Hardness93
Shore D Hardness70
Shore A Hardness5
Specific Gravity1.07 g/cc1.52 g/cc1.05 g/cc
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentOff WhiteOff White
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi
Tensile Modulus1,503,000 psi134,000 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %8 %
100% Modulus15 psi
Compressive Strength16,350 psi3,550 psi
Compressive Modulus142,600 psi40,300 psi
Flexural Strength5,890 psi3,500 psi
Flexural Modulus710,000 psi110,000 psi
Shrinkage<.001 in. / in.0.001 in. / in.0.007 in. / in.
Heat Deflection Temp129 °F140 °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® 322

The Smooth-Cast® 320 Series consists of ultra-low viscosity casting resins that yield virtually bubble-free off-white castings. The Smooth-Cast® 320 resins are sister products to our popular Smooth-Cast® 300 Series of bright white plastics, but are easier to color using SO-Strong® or Ignite® color tints. Smooth-Cast® 320 series is easy to mix and pour, offering the convenience of a 1A:1B by volume or 100A : 90B by weight mix ratio.

The Smooth-Cast® 320 Series resins readily accept pigments and fillers (such as URE-FIL® 3, 5 and 7 from Smooth-On). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 320 Series resins include reproducing small to medium size sculptures, making prototype models, special effect props, decorative jewelry and taxidermy (bones, antlers, teeth etc.).

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