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Ecoflex™ 5

Ecoflex™ 5 vs. TASK™ 21 vs. EpoxAcast™ 655 + 102 Hardener

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 21

Ecoflex™ 5 vs. TASK™ 21 vs. EpoxAcast™ 655 + 102 HardenerEcoflex™ 5 versus EpoxAcast™ 655 + 102 Hardener

High Performance Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps500 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)2A:1B
Pot Life1 minute75 minutes6 minutes
Cure Time5 minutes9 hours1 hour
Shore D Hardness9075
Shore A Hardness5
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentGreyWhite
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™ 5EpoxAcast™ 655 + 102 HardenerTASK™ 21
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
  • Urethane Resins
Mixed Viscosity13,000 cps23,000 cps500 cps
Mix Ratio By Volume1A:1B2A:1B
Mix Ratio By Weight1A:1B100A:11B2A:1B
Pot Life1 minute75 minutes6 minutes
Cure Time5 minutes9 hours1 hour
Shore D Hardness9075
Shore A Hardness5
Specific Gravity1.07 g/cc1.66 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.16.7 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentGreyWhite
Die B Tear Strength75 pli
Tensile Strength350 psi5,500 psi
Tensile Modulus2,040,000 psi270,000 psi
Ultimate Tensile4,810 psi
Elongation @ Break1,000 %7.5 %
100% Modulus15 psi
Compressive Strength12,500 psi7,100 psi
Compressive Modulus125,500 psi78,500 psi
Flexural Strength7,660 psi7,100 psi
Flexural Modulus1,403,000 psi250,000 psi
Shrinkage<.001 in. / in.0.0006 in. / in.0.0058 in. / in.
Heat Deflection Temp135 °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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EpoxAcast™ 655 + 102 Hardener

EpoxAcast655 (formerly Metalset™ A-30) is a versatile aluminum filled castable epoxy that is very hard and strong. It is dimensionally stable, even when mass cast up to 512 in3 / 8,390 cm3.

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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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