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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Metal‌set® A4

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Metal‌set® A4Ecoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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Metal‌set® A4

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Metal‌set® A4Ecoflex™ 5 versus Smooth-Cast® 310

High performance epoxy adhesive

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps80 cpsPaste
Pot Life1 minute20 minutes22 minutes
Cure Time5 minutes4 hours16 hours
Barcol 935 Hardness71
Shore D Hardness70
Shore A Hardness5
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.19.5 cu. in./lb.
ColorTranslucentWhiteMetallic
Elongation @ Break1,000 %7.5 %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® 310Metal‌set® A4
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps80 cpsPaste
Mix Ratio By Volume1A:1B1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:90B1A:1B
Pot Life1 minute20 minutes22 minutes
Cure Time5 minutes4 hours16 hours
Barcol 935 Hardness71
Shore D Hardness70
Shore A Hardness5
Specific Gravity1.07 g/cc1.05 g/cc1.43 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.19.5 cu. in./lb.
ColorTranslucentWhiteMetallic
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi3,600 psi
Tensile Modulus134,000 psi165,000 psi
Elongation @ Break1,000 %7.5 %1.2 %
100% Modulus15 psi
Compressive Strength3,800 psi7,500 psi
Compressive Modulus44,900 psi160,000 psi
Flexural Strength4,000 psi
Flexural Modulus118,000 psi
Shrinkage<.001 in. / in.0.0065 in. / in.
Heat Deflection Temp120 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Sag Resistance1/4 in.

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® 310

The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.

These resins readily accept fillers (such as URE-FIL® 3 from Smooth-On) and can be colored with SO-Strong® or Ignite® color tints (Smooth-Cast® 325 series accepts pigments better than the Smooth Cast® 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.

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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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