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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® 66D vs. TASK™ 14

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 14

Ecoflex™ 5 vs. Smooth-Cast® 66D vs. TASK™ 14Ecoflex™ 5

Semi-Rigid Black Urethane Casting Resin

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Smooth-Cast® 66D

Ecoflex™ 5 vs. Smooth-Cast® 66D vs. TASK™ 14Ecoflex™ 5 versus TASK™ 14

Semi-Rigid Urethane Casting Resins

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps800 cps120 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)1A:1B
Pot Life1 minute10 minutes7 minutes
Cure Time5 minutes45 minutes60 minutes
Shore D Hardness5066
Shore A Hardness5
ColorTranslucentBlackGrey
Tensile Strength350 psi1,800 psi2,400 psi
Elongation @ Break1,000 %125 %20 %
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™ 14Smooth-Cast® 66D
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps800 cps120 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:120B100A:93B
Pot Life1 minute10 minutes7 minutes
Cure Time5 minutes45 minutes60 minutes
Shore D Hardness5066
Shore A Hardness5
Specific Gravity1.07 g/cc1.15 g/cc1.05 g/cc
Specific Volume25.8 cu. in./lb.24.1 cu. in./lb.26.4 cu. in./lb.
ColorTranslucentBlackGrey
Die B Tear Strength75 pli
Tensile Strength350 psi1,800 psi2,400 psi
Elongation @ Break1,000 %125 %20 %
100% Modulus15 psi
Shrinkage<.001 in. / in.0.0035 in. / in.0.01 in. / in.
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™ 14

TASK™ 14 is a fast setting two-component urethane that cures quickly to black semi-rigid plastic. TASK™ 14 offers a longer pot life (10 minutes) and demold time of 45 minutes.

With a Shore value of 50D, these semi-rigid plastics are used for a variety of industrial applications including fast mold making, fast model duplication, prototyping, durable miniatures, black props and special effects, or making parts that are impact resistant. Fully cured castings are tough, durable and chemical resistant.

For Best Results… Do not cast TASK™ 14 into platinum cure (addition cure) silicone molds.

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Smooth-Cast® 66D

The Smooth-Cast® Semi-Rigid line of low-cost semi-rigid urethane casting resins cure quickly to semi-rigid plastics that offer excellent impact resistance. These plastics are easy-to-use (mix ratio is 1A:1B by volume) and have low viscosities for minimal bubble entrapment. Vibrant colors are possible by adding SO-Strong® color tints or Ignite® color pigments.

These semi-rigid plastics will really take a beating and offer exceptional abrasion resistance. They are good for making high-impact resistance tools, prototypes, abrasion resistant parts, foundry patterns, roller facings, vibration pads, fast concrete stamping pads, etc.

Smooth-Cast® 66D is a grey resin with a 7 minute pot life and 60 minute demold time.

NOTE: Do not use Smooth-Cast® 66D for roto casting.

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