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Ecoflex™ 5

FMC™ 200 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Polysulfide Rubber
Mixed Viscosity13,000 cps100 cps6,000 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes50 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness80
Shore A Hardness520
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.20.5 cu. in./lb.
ColorTranslucentBlackBlack
Tensile Strength350 psi5,840 psi157 psi
Elongation @ Break1,000 %4 %700 %
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™ 5Smooth-Cast® ONYX™ FASTFMC™ 200
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Polysulfide Rubber
Mixed Viscosity13,000 cps100 cps6,000 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B100A:12B
Pot Life1 minute2.5 minutes50 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness80
Shore A Hardness520
Specific Gravity1.07 g/cc1.09 g/cc1.35 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.20.5 cu. in./lb.
ColorTranslucentBlackBlack
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi157 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %700 %
100% Modulus15 psi29 psi
Compressive Strength8,760 psi
Compressive Modulus77,400 psi
Flexural Strength8,280 psi
Flexural Modulus246,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.negligible in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Heat Deflection With Post Cure250 °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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Smooth-Cast® ONYX™ FAST

Smooth-Cast® ONYX™ is a mercury-free urethane resin that cures at room temperature to a deep black, solid plastic. ONYX™ resins offer the convenience of a 1A:1B by volume mix ratio and have very low viscosities, so they are easy to mix and pour. ONYX™ resins have an ultimate Shore hardness of 80D and offer higher physical properties and higher heat resistance vs. other general purpose resins.ONYX™ FAST resin has a pot life of 2.5 minutes and a cure time of 10-15 minutes. ONYX™ FAST is a good choice for creating fast cold cast bronze, brass, copper, nickel/silver, etc. effects.

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FMC™ 200

FMC™-200 is a polysulfide rubber mold compound with high tear strength that cures overnight with negligible shrinkage. Molds made of FMC™-200 are very durable and will perform in production. The mix ratio is 100 parts of Part A to 12 parts of Part B by weight. FMC™-200 cures to a Shore hardness of 20 A.

FMC™-200 is ideal for those applications that require capturing intricate detail from a variety of model surfaces. Unlike polyurethanes, FMC™-200 is not sensitive to moisture and can be poured directly over wet plaster or water/sulfur based clays. Common applications include molds for foundry and pattern work, sculpture (lost wax process), casting various gypsum products and waxes.

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