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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. TASK™ 21

Super-Soft, Addition Cure Silicone Rubber

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Smooth-Cast® 310

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. TASK™ 21Ecoflex™ 5

Bright White, Ultra Low Viscosity Liquid Plastics

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TASK™ 21

Ecoflex™ 5 vs. Smooth-Cast® 310 vs. TASK™ 21Ecoflex™ 5 versus Smooth-Cast® 310

High Performance Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps500 cps
Pot Life1 minute20 minutes6 minutes
Cure Time5 minutes4 hours1 hour
Shore D Hardness7075
Shore A Hardness5
ColorTranslucentWhiteWhite
Tensile Strength350 psi3,000 psi5,500 psi
Elongation @ Break1,000 %7.5 %7.5 %
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® 310TASK™ 21
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps80 cps500 cps
Mix Ratio By Volume1A:1B1A:1B2A:1B
Mix Ratio By Weight1A:1B100A:90B2A:1B
Pot Life1 minute20 minutes6 minutes
Cure Time5 minutes4 hours1 hour
Shore D Hardness7075
Shore A Hardness5
Specific Gravity1.07 g/cc1.05 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.26.4 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentWhiteWhite
Die B Tear Strength75 pli
Tensile Strength350 psi3,000 psi5,500 psi
Tensile Modulus134,000 psi270,000 psi
Elongation @ Break1,000 %7.5 %7.5 %
100% Modulus15 psi
Compressive Strength3,800 psi7,100 psi
Compressive Modulus44,900 psi78,500 psi
Flexural Strength4,000 psi7,100 psi
Flexural Modulus118,000 psi250,000 psi
Shrinkage<.001 in. / in.0.0065 in. / in.0.0058 in. / in.
Heat Deflection Temp120 °F144 °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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TASK™ 21

TASK™ 21 is a performance urethane casting resin that has been described by many as having similar performance and mechanical characteristics to ABS plastic, with high compressive and flexural strength. TASK 21 has no odor and is easy to process. Mix ratio is 2A:1B by weight or volume. Pot life is 6 minutes and handling strength is reached in 60 minutes at room temperature (depending on mass and configuration).

TASK 21 features a low mixed viscosity of 500 cps and readily de-airs itself when cast into molds. SO-Strong™ or IGNITE™ colorants can be added for color and a variety of powder fillers can be added to alter performance or appearance characteristics. Applications for TASK 21 include rapid prototyping, casting strong and highly detailed models, making holding / assembly fixtures, figurines and decorative castings.

IMPORTANT - TASK 21 can not be cast into platinum-cure silicone molds. We recommend casting TASK 21 into tin-cure silicone or urethane rubber molds (using a release agent).

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