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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast™ 325 vs. EpoxAcast™ 650 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

Ecoflex™ 5 vs. Smooth-Cast™ 325 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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Smooth-Cast™ 325

Ecoflex™ 5 vs. Smooth-Cast™ 325 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 650 + 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 cps7,000 cps100 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute90 minutes2.5 minutes
Cure Time5 minutes4 hours10 minutes
Barcol 935 Hardness93
Shore D Hardness72
Shore A Hardness5
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentOff WhiteClear 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™ 650 + 102 HardenerSmooth-Cast™ 325
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps7,000 cps100 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:13B115A:100B
Pot Life1 minute90 minutes2.5 minutes
Cure Time5 minutes4 hours10 minutes
Barcol 935 Hardness93
Shore D Hardness72
Shore A Hardness5
Specific Gravity1.07 g/cc1.52 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentOff WhiteClear Amber
Die B Tear Strength75 pli
Tensile Strength350 psi3,170 psi
Tensile Modulus1,503,000 psi140,000 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %10 %
100% Modulus15 psi
Compressive Strength16,350 psi3,500 psi
Compressive Modulus142,600 psi36,500 psi
Flexural Strength5,890 psi3,690 psi
Flexural Modulus710,000 psi101,000 psi
Shrinkage<.001 in. / in.0.001 in. / in.0.01 in. / in.
Heat Deflection Temp129 °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™ 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™ 325

The Smooth-Cast™ 325, 326 & 327 ColorMatch™ Series plastics are urethane 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 UVO™ pigments 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). Because of its neutral color, Smooth-Cast™ 325 is ideal for creating marble and wood grain casting effects, or duplicating the look of real metal by adding bronze, brass or other metal powder. 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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