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Ecoflex™ 5

Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener vs. Compat™ 45

Super-Soft, Addition Cure Silicone Rubber

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Compat™ 45

Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener vs. Compat™ 45Ecoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

Non-Inhibiting Urethane Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps23,000 cps2,600 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute75 minutes25 minutes
Cure Time5 minutes9 hours16 hours
Shore D Hardness90
Shore A Hardness545
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.24.7 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 HardenerCompat™ 45
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps23,000 cps2,600 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:11B85A:100B
Pot Life1 minute75 minutes25 minutes
Cure Time5 minutes9 hours16 hours
Shore D Hardness90
Shore A Hardness545
Specific Gravity1.07 g/cc1.66 g/cc1.12 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.24.7 cu. in./lb.
ColorTranslucentGreyOff White
Die B Tear Strength75 pli
Die C Tear Strength101 pli
Tensile Strength350 psi629 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %772 %
100% Modulus15 psi137 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
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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Compat™ 45

Compat™ 45 urethane is a unique urethane rubber which will not inhibit the cure of most Smooth-On platinum or tin cure silicone rubbers. It features a low viscosity for easy mixing and pouring and cures with minimal bubble entrapment. Mix ratio is 1A:1B by volume (85A:100B by weight), pot life is 25 minutes and the rubber cures with an ultimate Shore hardness of Shore 45A. Cured rubber is dimensionally stable (low shrinkage), offers good wear resistance and excellent library life. Compat™ 45 can be used for a variety of applications including making molds to cast silicone prop body parts, animatronic skins and medical trainers, as well as for making rubber masters which can be molded using platinum or tin silicone without inhibition concerns.

Important; Do not use Ecoflex™ Gel, Ecoflex™ 00-10, Encapso-K, Rubber Glass™, Solaris™ or Sorta-Clear™ 12 or 37 with this product. They are not compatible and inhibition will result.

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