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Ecoflex™ 5

Smooth-Cast® 300 vs. Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

Smooth-Cast® 300 vs. Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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Smooth-Cast® 300

Smooth-Cast® 300 vs. Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 650 + 102 Hardener

Bright White Liquid Plastic

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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 minutes3 minutes
Cure Time5 minutes4 hours10 minutes
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 WhiteWhite
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® 300
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 minutes3 minutes
Cure Time5 minutes4 hours10 minutes
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 WhiteWhite
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi
Tensile Modulus1,503,000 psi139,500 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %5 %
100% Modulus15 psi
Compressive Strength16,350 psi4,000 psi
Compressive Modulus142,600 psi45,800 psi
Flexural Strength5,890 psi4,510 psi
Flexural Modulus710,000 psi128,000 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® 300

The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.

These resins readily accept fillers (such as URE-FIL® 3 ) and can be colored with SO-Strong® or Ignite® color tints (Smooth-Cast® 325 series accepts pigments better than the Smooth Cast® 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.

Those interested in making roto cast pieces should refer to the Smooth-Cast® 65D technical bulletin.

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