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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Super Instant™

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps100 cpsLight Paste
Pot Life1 minute2.5 minutes2.5 minutes
Cure Time5 minutes15 minutes10 minutes
Barcol 935 Hardness60
Shore D Hardness80
Shore A Hardness5
ColorTranslucentBlackClear Amber
Tensile Strength350 psi5,840 psi1,100 psi
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™ FASTSuper Instant™
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps100 cpsLight Paste
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B
Pot Life1 minute2.5 minutes2.5 minutes
Cure Time5 minutes15 minutes10 minutes
Barcol 935 Hardness60
Shore D Hardness80
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.17 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.
ColorTranslucentBlackClear Amber
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi1,100 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %10+ %
100% Modulus15 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.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Modulus of Elasticity in Compression115,000 psi
Compressive Yield Strength4,500 psi
Heat Deflection With Post Cure250 °F
Modulus of Elasticity in Tension27,000 psi

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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Super Instant™

Smooth-On Super Instant™ Epoxy is a two component, clear amber adhesive designed to provide rapid bonding. When mixed in equal proportions—either by volume or by weight—curing takes place quickly enough to permit handling in 5 to 10 minutes at room temperature. Super Instant™ adheres to metals such as steel, aluminum and brass, to wood, glass, masonry and many hard plastics.

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