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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps100 cps
Pot Life1 minute20 minutes2.5 minutes
Cure Time5 minutes4 hours15 minutes
Shore D Hardness7080
Shore A Hardness5
ColorTranslucentWhiteBlack
Tensile Strength350 psi3,000 psi5,840 psi
Elongation @ Break1,000 %7.5 %4 %
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® 310Smooth-Cast® ONYX™ FAST
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps100 cps
Mix Ratio By Volume1A:1B1A:1B100A:100B
Mix Ratio By Weight1A:1B100A:90B120A:100B
Pot Life1 minute20 minutes2.5 minutes
Cure Time5 minutes4 hours15 minutes
Shore D Hardness7080
Shore A Hardness5
Specific Gravity1.07 g/cc1.05 g/cc1.09 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.27.7 cu. in./lb.
ColorTranslucentWhiteBlack
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi5,840 psi
Tensile Modulus134,000 psi246,000 psi
Elongation @ Break1,000 %7.5 %4 %
100% Modulus15 psi
Compressive Strength3,800 psi8,760 psi
Compressive Modulus44,900 psi77,400 psi
Flexural Strength4,000 psi8,280 psi
Flexural Modulus118,000 psi246,000 psi
Shrinkage<.001 in. / in.0.0065 in. / in.0.010 in. / in.
Heat Deflection Temp120 °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® 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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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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