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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Crystal Clear™ 206

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Crystal Clear™ 206Ecoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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Crystal Clear™ 206

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. Crystal Clear™ 206Ecoflex™ 5 versus Smooth-Cast® 310

Clear Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps600 cps
Mix Ratio By Volume1A:1B1A:1BN/A (gram scale required)
Pot Life1 minute20 minutes4.5 hours
Cure Time5 minutes4 hours7 days
Shore D Hardness7080
Shore A Hardness5
ColorTranslucentWhiteClear
Tensile Strength350 psi3,000 psi2,500 psi
Elongation @ Break1,000 %7.5 %10 %
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® 310Crystal Clear™ 206
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps600 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:90B100A:90B
Pot Life1 minute20 minutes4.5 hours
Cure Time5 minutes4 hours7 days
Shore D Hardness7080
Shore A Hardness5
Specific Gravity1.07 g/cc1.05 g/cc1.036 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.26.7 cu. in./lb.
ColorTranslucentWhiteClear
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi2,500 psi
Tensile Modulus134,000 psi
Elongation @ Break1,000 %7.5 %10 %
100% Modulus15 psi
Compressive Strength3,800 psi6,385 psi
Compressive Modulus44,900 psi40,000 psi
Flexural Strength4,000 psi10,650 psi
Flexural Modulus118,000 psi200,000 psi
Shrinkage<.001 in. / in.0.0065 in. / in.0.002 in. / in.
Heat Deflection Temp120 °F120 °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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Crystal Clear™ 206

Crystal Clear™ 206 is a water white clear and made specifically for applications that require clarity. These rigid urethane casting resins differ only in working and demold times. Low viscosity ensures easy mixing and pouring. Crystal Clear™ resins cure at room temperature* with negligible shrinkage.

CAUTION: NOT FOR HOME USE. THIS PRODUCT IS FOR INDUSTRIAL USE ONLY. With adequate local exhaust ventilation, respiratory protection is not normally required when using this product. Where risk assessment shows air-purifying respirators are appropriate, follow OSHA respirator regulations and European Standards EN 141, 143 and 371. Protective clothing (gloves and long sleeves) is required to minimize the risk of dermal sensitization. If breathing is affected or a dermal rash develops, immediately cease using this product and seek medical attention. Read SDS before using.

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