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Ecoflex™ 5

Ecoflex™ 5 vs. TASK™ 21

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 21

Ecoflex™ 5 vs. TASK™ 21Ecoflex™ 5

High Performance Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps500 cps
Pot Life1 minute6 minutes
Cure Time5 minutes1 hour
Shore D Hardness75
Shore A Hardness5
ColorTranslucentWhite
Tensile Strength350 psi5,500 psi
Elongation @ Break1,000 %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™ 5TASK™ 21
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps500 cps
Mix Ratio By Volume1A:1B2A:1B
Mix Ratio By Weight1A:1B2A:1B
Pot Life1 minute6 minutes
Cure Time5 minutes1 hour
Shore D Hardness75
Shore A Hardness5
Specific Gravity1.07 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentWhite
Die B Tear Strength75 pli
Tensile Strength350 psi5,500 psi
Tensile Modulus270,000 psi
Elongation @ Break1,000 %7.5 %
100% Modulus15 psi
Compressive Strength7,100 psi
Compressive Modulus78,500 psi
Flexural Strength7,100 psi
Flexural Modulus250,000 psi
Shrinkage<.001 in. / in.0.0058 in. / in.
Heat Deflection Temp144 °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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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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Silicone Rubber - Tin Cure ›

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