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Ecoflex™ 5

Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener vs. Mold Star™ 31T

Super-Soft, Addition Cure Silicone Rubber

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EpoxAcast™ 650 + 102 Hardener

Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener vs. Mold Star™ 31TEcoflex™ 5

Mineral Filled General Purpose Casting Epoxy

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Mold Star™ 31T

Ecoflex™ 5 vs. EpoxAcast™ 650 + 102 Hardener vs. Mold Star™ 31TEcoflex™ 5 versus EpoxAcast™ 650 + 102 Hardener

1A:1B Mix By Volume Translucent Platinum Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps7,000 cps11,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute90 minutes5 minutes
Cure Time5 minutes4 hours23 minutes
Barcol 935 Hardness93
Shore A Hardness530
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.25.6 cu. in./lb.
ColorTranslucentOff WhiteTranslucent
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 HardenerMold Star™ 31T
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps7,000 cps11,000 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:13B1A:1B
Pot Life1 minute90 minutes5 minutes
Cure Time5 minutes4 hours23 minutes
Barcol 935 Hardness93
Shore A Hardness530
Specific Gravity1.07 g/cc1.52 g/cc1.08 g/cc
Specific Volume25.8 cu. in./lb.18.22 cu. in./lb.25.6 cu. in./lb.
ColorTranslucentOff WhiteTranslucent
Die B Tear Strength75 pli90 pli
Tensile Strength350 psi420 psi
Tensile Modulus1,503,000 psi
Ultimate Tensile6,000 psi
Elongation @ Break1,000 %400 %
100% Modulus15 psi47 psi
Compressive Strength16,350 psi
Compressive Modulus142,600 psi
Flexural Strength5,890 psi
Flexural Modulus710,000 psi
Shrinkage<.001 in. / in.0.001 in. / in.< .001 in. / in.
Heat Deflection Temp129 °F
Useful Temperature (min)-65 °F-65 °F
Useful Temperature (max)450 °F450 °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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Mold Star™ 31T

Mold Star31T is an easy to use Shore 30A translucent platinum silicone that is mixed 1A:1B by volume (no weighing scale necessary). It features a relatively low viscosity and vacuum degassing is not required for most applications. Pot life is 5 minutes and cure time is 23 minutes at room temperature.

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