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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. EpoxAmite™ HT

Super-Soft, Addition Cure Silicone Rubber

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EpoxAmite™ HT

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. EpoxAmite™ HTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

High-Temp Laminating Epoxy

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Casting and Laminating Resins
Mixed Viscosity13,000 cps100 cps650 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes60 minutes
Cure Time5 minutes15 minutes24 hours
Shore D Hardness8080
Shore A Hardness5
ColorTranslucentBlackClear
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™ FASTEpoxAmite™ HT
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy Casting and Laminating Resins
Mixed Viscosity13,000 cps100 cps650 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B100A:33B
Pot Life1 minute2.5 minutes60 minutes
Thin Film Working Time180 minutes
Cure Time5 minutes15 minutes24 hours
Shore D Hardness8080
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.1 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.25.2 cu. in./lb.
ColorTranslucentBlackClear
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi342,000 psi
Ultimate Tensile6,500 psi
Tensile Elongation2.3 %
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi16,600 psi
Compressive Modulus77,400 psi168,000 psi
Flexural Strength8,280 psi12,325 psi
Flexural Modulus246,000 psi429,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Heat Deflection With Post Cure250 °F300 °F
Ultimate Tensile on 6 ply / 10 oz. Laminate32,100 psi
Flexural Strength on 6 ply / 10 oz. Laminate20,700 psi
Tensile Modulus on 6 ply / 10 oz. Laminate2,150,000 psi
Flexural Modulus on 6 ply / 10 oz. Laminate2,216,000 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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EpoxAmite™ HT

EpoxAmite™ HT High Temperature Laminating Epoxy is a water clear, UV resistant laminating epoxy that resists high temperatures up to 300°F / 149°C when properly cured. Pot life is 1 hour and cure time is 24 hours at 73°F / 23°C (post cure required – see post cure schedule). Ultra-low viscosity ensures uniform wetting out and fast penetration of reinforcement materials during hand lay-up or vacuum infusion processes. Cured resin offers superior physical properties.

EpoxAmite™ HT High Temp Laminating Epoxy can be used with S-Glass, E-Glass, Kevlar and carbon fibers for making composite tooling or parts.  Applications include making high temperature pre-preg parts, bonding fixtures, vacuum form molds and prototype injection molds.
Use as a backup laminating resin for EpoxAcoat™ HT high temperature surface coat epoxy.

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