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Ecoflex™ 5

Ecoflex™ 5 vs. Simpact™ 85A vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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Simpact™ 85A

Ecoflex™ 5 vs. Simpact™ 85A vs. EpoxAcast™ 655 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

Tough, Fast Setting Urethane

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Rubber
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps1,100 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)N/A (gram scale required)
Pot Life1 minute75 minutes4 minutes
Cure Time5 minutes9 hours48 hours
Shore D Hardness90
Shore A Hardness585
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.4 cu. in./lb.
ColorTranslucentGreyOff 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 HardenerSimpact™ 85A
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Rubber
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps1,100 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:11B85A:100B
Pot Life1 minute75 minutes4 minutes
Handling Time2 hours
Cure Time5 minutes9 hours48 hours
Shore D Hardness90
Shore A Hardness585
Specific Gravity1.07 g/cc1.66 g/cc1.09 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.4 cu. in./lb.
ColorTranslucentGreyOff White
Die B Tear Strength75 pli
Die C Tear Strength182 pli
Tensile Strength350 psi1,573 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %164 %
100% Modulus15 psi1,213 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.<.007 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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Simpact™ 85A

Simpact™ 85A urethane is a low odor, fast-setting urethane elastomer which offers very high tear strength, impact resistance and wear resistance. Simpact™ urethanes are phthalate free, mercury free and MOCA free. Simpact™ urethanes pour easily. Working time is 4 minutes, handling time is 2 hours and full cure time is 48 hours at room temperature.

Cured rubber has exceptional performance characteristics and dimensional stability. Simpact™ urethanes can be colored with SO-Strong™ or Ignite™ colorants. Simpact™ urethanes are suitable for making impact resistant props, prototypes and display pieces.

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