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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 380 vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 380

Ecoflex™ 5 vs. Smooth-Cast® 380 vs. EpoxAcast™ 655 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

High Density Urethane Tooling Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps1,140 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute75 minutes6 minutes
Cure Time5 minutes9 hours60 minutes
Shore D Hardness9082
Shore A Hardness5
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.15.9 cu. in./lb.
ColorTranslucentGreyTan
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® 380
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps1,140 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:11B1A:1B
Pot Life1 minute75 minutes6 minutes
Cure Time5 minutes9 hours60 minutes
Shore D Hardness9082
Shore A Hardness5
Specific Gravity1.07 g/cc1.66 g/cc1.74 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.15.9 cu. in./lb.
ColorTranslucentGreyTan
Die B Tear Strength75 pli
Tensile Strength350 psi3,550 psi
Tensile Modulus2,040,000 psi490,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %1.43 %
100% Modulus15 psi
Compressive Strength12,500 psi7,860 psi
Compressive Modulus125,500 psi126,000 psi
Flexural Strength7,660 psi4,870 psi
Flexural Modulus1,403,000 psi315,000 psi
Shrinkage<.001 in. / in.0.0006 in. / in.0.0025 in. / in.
Heat Deflection Temp135 °F125 °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® 380

Smooth-Cast® 380 is a filled, high density casting resin formulated for a variety of tooling applications. This no-odor resin features a convenient 1A:1B mix ratio by volume, a 6 minute pot-life and cure time of about 60 minutes depending on mass and temperature. Low viscosity ensures minimal bubble entrapment and long term shrinkage of cured resin is very low. Cured material is very strong can be machined, drilled, sanded, etc. Color can be added with SO-Strong® color tints.

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