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Ecoflex™ 5

Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener vs. Smooth-Cast® 57D

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 57D

Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener vs. Smooth-Cast® 57DEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

Semi-Rigid Urethane Casting 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 cps300 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute75 minutes3 minutes
Cure Time5 minutes9 hours30 minutes
Shore D Hardness9057
Shore A Hardness5
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentGreyTranslucent White
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® 57D
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps300 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:11B100A:93B
Pot Life1 minute75 minutes3 minutes
Cure Time5 minutes9 hours30 minutes
Shore D Hardness9057
Shore A Hardness5
Specific Gravity1.07 g/cc1.66 g/cc1.05 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentGreyTranslucent White
Die B Tear Strength75 pli
Tensile Strength350 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi2,420 psi
Elongation @ Break1,000 %100 %
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.0.012 in. / in.
Heat Deflection Temp135 °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® 57D

Smooth-Cast® 57D is a semi-rigid urethane plastic that offers a gradual cure profile (does not snap cure), making it suitable for machine or hand rotational casting.

Use For Rotational Casting - Once poured into a suitable rubber mold configuration, the mold can be rotated so that the resin mixture gradually coats the inside of the mold cavity. After an adequate wall thickness is attained inside the mold, the result is a cured hollow casting that is semi-rigid and highly impact resistant.

Use as a Casting Resin – Smooth-Cast® 57D can also be used as a casting resin for making solid, semi-rigid castings that are tough and durable.

Mix ratio is 1A:1B by volume. Working time is 3 minutes, demold time is 30 minutes and full cure properties are attained after 24 hours. Color is white translucent and the material is very easy to color with SO-Strong®, UVO® or Ignite® colorants. Cured resin is also easy to paint with acrylic paints or UreCoat® flexible coating for applications requiring thick, durable finishes.

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