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Ecoflex™ 5

EpoxAcoat™ GREY vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Casting and Laminating Resins
  • Epoxy and Urethane Coatings
Mixed Viscosity13,000 cps100 cpsLight Paste
Pot Life1 minute2.5 minutes20 minutes
Cure Time5 minutes15 minutes16 hours
Barcol 935 Hardness87
Shore D Hardness8085
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.19.4 cu. in./lb.
ColorTranslucentBlackGrey
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™ FASTEpoxAcoat™ GREY
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Casting and Laminating Resins
  • Epoxy and Urethane Coatings
Mixed Viscosity13,000 cps100 cpsLight Paste
Mix Ratio By Volume1A:1B100A:100B5A:1B
Mix Ratio By Weight1A:1B120A:100B100A:15B
Pot Life1 minute2.5 minutes20 minutes
Thin Film Working Time40 minutes
Thin Film Recoat Time60 minutes
Tack Free Time4 hours
Cure Time5 minutes15 minutes16 hours
Barcol 935 Hardness87
Shore D Hardness8085
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.43 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.19.4 cu. in./lb.
ColorTranslucentBlackGrey
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi
Ultimate Tensile26,000 psi
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi24,000 psi
Compressive Modulus77,400 psi
Flexural Strength8,280 psi30,000 psi
Flexural Modulus246,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.00015 in. / in.
Heat Deflection Temp133 °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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EpoxAcoat™ GREY

EpoxAcoat™ RED, EpoxAcoat™ GREY and EpoxAcoat™ WHITE are thixotropic epoxy gel coats which are widely used for hand laminating and tooling applications. They are tough and strong surface coat resins which cure at room temperature and offer exceptional abrasion resistance. For high temperature applications (to 284°F / 140°C) use EpoxAcoat HT™ (see separate technical bulletin).

EpoxAcoat™ RED, EpoxAcoat™ GREY and EpoxAcoat™ WHITE are easy to use, wet out well over a variety of surfaces and will coat vertical surfaces without sagging. After the epoxy becomes “tacky-hard” at room temperature, fiberglass cloth is laminated behind the surface coat using Free Form™ AIR putty or EpoxAmite™ Laminating Epoxy to produce strong, lightweight tools that have excellent dimensional stability and surface finish. Cured surface machines precisely without chipping. Applications include precision tooling, master and pattern making, core boxes and fixtures.

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