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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Smooth-Cast® 385

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Smooth-Cast® 385Ecoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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Smooth-Cast® 385

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Smooth-Cast® 385Ecoflex™ 5 versus Smooth-Cast® 310

Mineral filled tooling resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps3,000 cps
Mix Ratio By Volume1A:1B1A:1BN/A (gram scale required)
Pot Life1 minute20 minutes20 minutes
Cure Time5 minutes4 hours2 hours
Shore D Hardness7085
Shore A Hardness5
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.17.3 cu. in./lb.
ColorTranslucentWhiteBeige
Tensile Strength350 psi3,000 psi3,100 psi
Elongation @ Break1,000 %7.5 %1 %
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® 385
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps3,000 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:90B1A:5B
Pot Life1 minute20 minutes20 minutes
Cure Time5 minutes4 hours2 hours
Shore D Hardness7085
Shore A Hardness5
Specific Gravity1.07 g/cc1.05 g/cc1.60 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.17.3 cu. in./lb.
ColorTranslucentWhiteBeige
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi3,100 psi
Tensile Modulus134,000 psi400,000 psi
Elongation @ Break1,000 %7.5 %1 %
100% Modulus15 psi
Compressive Strength3,800 psi8,500 psi
Compressive Modulus44,900 psi400,000 psi
Flexural Strength4,000 psi5,900 psi
Flexural Modulus118,000 psi433,000 psi
Shrinkage<.001 in. / in.0.0065 in. / in.0.0006 in. / in.
Heat Deflection Temp120 °F135 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °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® 385

Smooth-Cast® 385 is a mineral filled urethane casting resin that is very hard and durable. When Parts A and B are mixed in proper proportion (1A:5B by weight), Smooth-Cast® 385 cures at room temperature with virtually no shrinkage. This rigid urethane casting resin has high compressive and flexural strength. Fully cured castings are tough, machinable and paintable.

Color effects are possible by adding pigment dispersions. They resist moisture and mild solvents. Smooth-Cast® 385 is ideal for making industrial production parts, foundry patterns, vacuum forming molds, and some ceramic applications

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