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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Soma Foama® 15

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Mix and Pour Expanding Foams
  • Skin Safe FX Materials
Mixed Viscosity13,000 cps100 cps10,000 cps
Pot Life1 minute2.5 minutes30 seconds
Cure Time5 minutes15 minutes1 hour
Shore D Hardness80
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.115 cu. in./lb.
ColorTranslucentBlackWhite
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™ FASTSoma Foama® 15
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Mix and Pour Expanding Foams
  • Skin Safe FX Materials
Mixed Viscosity13,000 cps100 cps10,000 cps
Mix Ratio By Volume1A:1B100A:100B2A:1B
Mix Ratio By Weight1A:1B120A:100B100A:47B
Pot Life1 minute2.5 minutes30 seconds
Handling Time20 minutes
Cure Time5 minutes15 minutes1 hour
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.115 cu. in./lb.
ColorTranslucentBlackWhite
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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Soma Foama® 15

Soma Foama® is a soft, two-component platinum silicone flexible foam that is versatile and easy to use. Soma Foama® 15 expands 4 times its original volume and develops a uniform 15 lb./cu. ft. cell structure (240 kg/m³). Vibrant colors can be achieved by adding Silc-Pig® silicone color pigments. Cured foam is high heat resistance (will resist up to 350°F/176°C), water resistant, UV resistant and resists oxidation and ozone degradation.

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