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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Shell Shock® FAST

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps3,000 cps
Pot Life1 minute2.5 minutes3 minutes
Cure Time5 minutes15 minutes60 minutes
Shore D Hardness8085
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.17.3 cu. in./lb.
ColorTranslucentBlackBeige
Tensile Strength350 psi5,840 psi3,100 psi
Elongation @ Break1,000 %4 %0.4 %
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™ FASTShell Shock® FAST
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps3,000 cps
Mix Ratio By Volume1A:1B100A:100B1A:4B
Mix Ratio By Weight1A:1B120A:100B1A:5B
Pot Life1 minute2.5 minutes3 minutes
Cure Time5 minutes15 minutes60 minutes
Shore D Hardness8085
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.60 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.17.3 cu. in./lb.
ColorTranslucentBlackBeige
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi3,100 psi
Tensile Modulus246,000 psi435,000 psi
Elongation @ Break1,000 %4 %0.4 %
100% Modulus15 psi
Compressive Strength8,760 psi9,000 psi
Compressive Modulus77,400 psi500,000 psi
Flexural Strength8,280 psi7,150 psi
Flexural Modulus246,000 psi980,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.0006 in. / in.
Heat Deflection Temp135 °F
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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Shell Shock® FAST

Shell Shock® FAST is a thixotropic plastic that self thickens when mixed and can be brushed onto a variety of surfaces or into rubber molds. When Parts A and B are mixed in proper proportion (1A:4B by volume or 1A:5B by weight), material cures at room temperature with virtually no shrinkage to a hard, durable plastic that exhibits good compressive and flexural strength. Fully cured castings are rigid and can be sanded, primed and painted. Color effects are possible by adding SO-Strong Color Tints.

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