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Ecoflex™ 5

FMC™ 205 vs. Ecoflex™ 5 vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Polysulfide Rubber
Mixed Viscosity13,000 cps23,000 cps6,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)N/A (gram scale required)
Pot Life1 minute75 minutes90 minutes
Cure Time5 minutes9 hours16 hours
Shore D Hardness90
Shore A Hardness512
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.20.1 cu. in./lb.
ColorTranslucentGreyBlack
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 HardenerFMC™ 205
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Polysulfide Rubber
Mixed Viscosity13,000 cps23,000 cps6,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:11B100A:12B
Pot Life1 minute75 minutes90 minutes
Cure Time5 minutes9 hours16 hours
Shore D Hardness90
Shore A Hardness512
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.
ColorTranslucentGreyBlack
Die B Tear Strength75 pli
Tensile Strength350 psi60 psi
Tensile Modulus2,040,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %550 %
100% Modulus15 psi15 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.
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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FMC™ 205

FMC™-205 is a polysulfide rubber mold compound that cures overnight with negligible shrinkage to a lasting durable rubber that will perform in production. The mix ratio is 100 parts of Part A to 12 parts of Part B by weight. FMC™-205 cures to a Shore hardness of 12 A.

FMC™-205 is ideal for those applications that require capturing intricate detail from a variety of model surfaces. Unlike polyurethanes, FMC™-205 is not sensitive to moisture and can be poured directly over wet plaster or water/sulfur based clays. Common applications include molds of sculpture (lost wax process), casting various gypsum products and waxes. 

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