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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. FOAM-iT!™ 15

Super-Soft, Addition Cure Silicone Rubber

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FOAM-iT!™ 15

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. FOAM-iT!™ 15Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Rigid Urethane Expanding Foams

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Mix and Pour Expanding Foams
Mixed Viscosity13,000 cps100 cps500 cps
Pot Life1 minute2.5 minutes1.5 minutes
Cure Time5 minutes15 minutes2 hours
Shore D Hardness80
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.105 cu. in./lb.
ColorTranslucentBlackBeige
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™ FASTFOAM-iT!™ 15
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Mix and Pour Expanding Foams
Mixed Viscosity13,000 cps100 cps500 cps
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B100A:87B
Pot Life1 minute2.5 minutes1.5 minutes
Tack Free Time20 minutes
Cure Time5 minutes15 minutes2 hours
Shore D Hardness80
Shore A Hardness5
Expansion (approximate)4 times
Foam Density15 lb/ft³
Specific Gravity1.07 g/cc1.09 g/cc0.24 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.105 cu. in./lb.
ColorTranslucentBlackBeige
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %
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
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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FOAM-iT!™ 15

Smooth-On’s FOAM-iT!™ Series are two-component water blown rigid foams that are versatile and easy to use. FOAM-iT!™ products are available in 3lb., 4 lb., 5 lb., 8 lb., 10 lb.,15 lb. or 26 lb. per cubic foot densities. Parts A and B are measured and mixed in equal amounts by volume. The mixture is then poured into a mold or other form (apply release agent if necessary). The mixture will expand many times original volume (depending on which FOAM-iT!™ product you are using) and develop a uniform cell structure. FOAM-IT!™ 15 is tack-free in about 4 - 6.5 minutes, developing handling strength in 20 minutes and full cure in 2 hours.

All FOAM-iT!™ products can be used as a straight casting material, backfill material for hollow castings (adds structural strength) or as an encapsulation material, etc. They can be color pigmented with SO-Strong™, UVO™ or IGNITE™ colorants and are used for a variety of art/ craft, industrial design and special effects applications.

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