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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Metal‌set® A4

Super-Soft, Addition Cure Silicone Rubber

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Metal‌set® A4

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Metal‌set® A4Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

High performance epoxy adhesive

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps100 cpsPaste
Pot Life1 minute2.5 minutes22 minutes
Cure Time5 minutes15 minutes16 hours
Barcol 935 Hardness71
Shore D Hardness80
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.19.5 cu. in./lb.
ColorTranslucentBlackMetallic
Elongation @ Break1,000 %4 %1.2 %
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™ FASTMetal‌set® A4
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps100 cpsPaste
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B1A:1B
Pot Life1 minute2.5 minutes22 minutes
Cure Time5 minutes15 minutes16 hours
Barcol 935 Hardness71
Shore D Hardness80
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.19.5 cu. in./lb.
ColorTranslucentBlackMetallic
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi3,600 psi
Tensile Modulus246,000 psi165,000 psi
Elongation @ Break1,000 %4 %1.2 %
100% Modulus15 psi
Compressive Strength8,760 psi7,500 psi
Compressive Modulus77,400 psi160,000 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
Sag Resistance1/4 in.
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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Metal‌set® A4

Metalset® A4 is a powerful epoxy adhesive that has been used for years by all branches of the U.S. Military as well as every major airline and auto manufacturer in the world. Metalset® A4 is used for hundreds of industrial bonding applications and offers excellent adhesion to porous or non-porous surfaces. It can be applied to vertical surfaces without sagging and cures overnight with negligible shrinking.

Once cured, Metal‌set® A4 offers good machining qualities (sanding, drilling, tapping), and resists alkalies, dilute acids and solvents. Applications include stopping leaks in pipes, valves and tanks (i.e. car gas tanks), bonding like and unlike surfaces, filling metal joints, dents, etc., anchoring bolts in wood, concrete, and repairing metal surfaces.

Bell Spec - Metalset A4 meets all quality requirements and can be certified to Bell Spec 299-947-099 Rev. D (see below for details)

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