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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 326 vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 326

Ecoflex™ 5 vs. Smooth-Cast® 326 vs. EpoxAcast™ 655 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

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 cps23,000 cps100 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute75 minutes9 minutes
Cure Time5 minutes9 hours60 minutes
Shore D Hardness9072
Shore A Hardness5
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentGreyClear Amber
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® 326
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps100 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:11B115A:100B
Pot Life1 minute75 minutes9 minutes
Cure Time5 minutes9 hours60 minutes
Shore D Hardness9072
Shore A Hardness5
Specific Gravity1.07 g/cc1.66 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentGreyClear Amber
Die B Tear Strength75 pli
Tensile Strength350 psi3,170 psi
Tensile Modulus2,040,000 psi140,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %10 %
100% Modulus15 psi
Compressive Strength12,500 psi3,080 psi
Compressive Modulus125,500 psi32,200 psi
Flexural Strength7,660 psi3,100 psi
Flexural Modulus1,403,000 psi95,700 psi
Shrinkage<.001 in. / in.0.0006 in. / in.0.0075 in. / in.
Heat Deflection Temp135 °F120 °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™ 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® 326

The Smooth-Cast® 325, 326 & 327 ColorMatch® Series plastics are fast-cast resins that were developed specifically for adding color pigments and fillers to achieve true color representation or filler effect. The ColorMatch® Series is formulated “color neutral”. Small amounts of pigment will yield accurate, vivid colors from cured castings using So-Strong® tints or Ignite® color pigments. The ColorMatch® Series offers the convenience of a 1A: 1B mix ratio by volume and has a very low viscosity. Demold times range from about 10 minutes to 2-4 hours (depending on product, mass and mold configuration). Note: Large mass castings will get very hot and shrink more, depending on mold configuration.

The ColorMatch® Series also readily accept fillers (such as URE-FIL® 3 from Smooth-On). Applications for the ColorMatch® Series plastics include making pigmented prototype models or figures, special effect props, reproducing small to medium size sculptures, decorative jewelry, etc.

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