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Ecoflex™ 5

Ecoflex™ 5 vs. PMC®-724 vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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PMC®-724

Ecoflex™ 5 vs. PMC®-724 vs. EpoxAcast™ 655 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

Polyurethane Rubber Compound

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps23,000 cps4,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)N/A (gram scale required)
Pot Life1 minute75 minutes20 minutes
Cure Time5 minutes9 hours16 hours
Shore D Hardness90
Shore A Hardness540
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.20.1 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 HardenerPMC®-724
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps23,000 cps4,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:11B10A:100B
Pot Life1 minute75 minutes20 minutes
Cure Time5 minutes9 hours16 hours
Shore D Hardness90
Shore A Hardness540
Specific Gravity1.07 g/cc1.66 g/cc1.38 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.20.1 cu. in./lb.
ColorTranslucentGreyOff-White
Die B Tear Strength75 pli
Die C Tear Strength90 pli
Tensile Strength350 psi600 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %>700 %
100% Modulus15 psi80 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.<.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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PMC®-724

Used by artists and industry the world over for a variety of design, casting and special effects applications, PMC®-724 is by far the most versatile urethane rubber compound available on the market today. It is inexpensive, mixes and pours easily, and will cure to a durable rubber with negligible shrinkage. Low viscosity ensures flawless pick-up of even the finest detail with minimal bubble entrapment.

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