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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. duoMatrix™-G

Super-Soft, Addition Cure Silicone Rubber

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duoMatrix™-G

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. duoMatrix™-GEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Polymer Additive System for Gypsum

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Polymer Modifiers for Concrete and Gypsum
Mixed Viscosity13,000 cps100 cpsVariable
Pot Life1 minute2.5 minutes60 minutes
Cure Time5 minutes15 minutes120 minutes
Shore D Hardness80
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.17.45 cu. in./lb.
ColorTranslucentBlackBright White
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™ FASTduoMatrix™-G
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Polymer Modifiers for Concrete and Gypsum
Mixed Viscosity13,000 cps100 cpsVariable
Mix Ratio By Volume1A:1B100A:100B100 Parts Gypsum + 50 Parts C-1 Latex + 10 Parts C-2 Resin + 0.5 Parts C-3 Hardener
Mix Ratio By Weight1A:1B120A:100B
Pot Life1 minute2.5 minutes60 minutes
Cure Time5 minutes15 minutes120 minutes
Shore D Hardness80
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.17.45 cu. in./lb.
ColorTranslucentBlackBright White
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi3300-5500 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi6500-9500 psi
Compressive Modulus77,400 psi
Flexural Strength8,280 psi7500-9800 psi
Flexural Modulus246,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F200 °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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duoMatrix™-G

duoMatrix™-G is a new three component polymer additive system that greatly enhances the physical properties of alpha gypsum products duoMatrix™-G (Matrix-G™ for short) reduces the demold and drying time of gypsum and drastically reduces water permeability making it suitable for both interior and exterior applications (for exterior use, product must be sealed – see “post finishing” section). Matrix™-G has less odor and yields elements that are a brighter white than competing products.

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Polymer Modifiers for Concrete and Gypsum ›