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Ecoflex™ 5

Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener vs. Mold Star™ 19T

Super-Soft, Addition Cure Silicone Rubber

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Mold Star™ 19T

Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener vs. Mold Star™ 19TEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

1A:1B Mix By Volume 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 cps23,000 cps11,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute75 minutes3 minutes
Cure Time5 minutes9 hours12 minutes
Shore D Hardness90
Shore A Hardness519
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.6 cu. in./lb.
ColorTranslucentGreyTranslucent
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 HardenerMold Star™ 19T
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps23,000 cps11,000 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:11B1A:1B
Pot Life1 minute75 minutes3 minutes
Cure Time5 minutes9 hours12 minutes
Shore D Hardness90
Shore A Hardness519
Specific Gravity1.07 g/cc1.66 g/cc1.08 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.6 cu. in./lb.
ColorTranslucentGreyTranslucent
Die B Tear Strength75 pli90 pli
Tensile Strength350 psi420 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %740 %
100% Modulus15 psi
Compressive Strength12,500 psi
Compressive Modulus125,500 psi
Flexural Strength7,660 psi
Flexural Modulus1,403,000 psi
Shrinkage<.001 in. / in.0.0006 in. / in.0.001 in. / in.
Heat Deflection Temp135 °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™ 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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Mold Star™ 19T

Mold Star™ 19T is an easy to use Shore 19A 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 3 minutes and cure time is 12 minutes at room temperature.

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