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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 4

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 4

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 4Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Urethane Casting Compound

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps250 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes20 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness8083
Shore A Hardness5
ColorTranslucentBlackIvory
Tensile Strength350 psi5,840 psi6,500 psi
Elongation @ Break1,000 %4 %4 %
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® ONYX™ FASTTASK™ 4
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps250 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B100A:100B
Pot Life1 minute2.5 minutes20 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness8083
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.167 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.23.9 cu. in./lb.
ColorTranslucentBlackIvory
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi6,500 psi
Tensile Modulus246,000 psi130,000 psi
Elongation @ Break1,000 %4 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi7,400 psi
Compressive Modulus77,400 psi75,000 psi
Flexural Strength8,280 psi9,000 psi
Flexural Modulus246,000 psi204,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.0035 in. / in.
Heat Deflection Temp110 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Heat Deflection With Post Cure250 °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® ONYX™ FAST

Smooth-Cast® ONYX™ is a mercury-free urethane resin that cures at room temperature to a deep black, solid plastic. ONYX™ resins offer the convenience of a 1A:1B by volume mix ratio and have very low viscosities, so they are easy to mix and pour. ONYX™ resins have an ultimate Shore hardness of 80D and offer higher physical properties and higher heat resistance vs. other general purpose resins.ONYX™ FAST resin has a pot life of 2.5 minutes and a cure time of 10-15 minutes. ONYX™ FAST is a good choice for creating fast cold cast bronze, brass, copper, nickel/silver, etc. effects.

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TASK™ 4

TASK™ 4 is a unique polyurethane casting resin that is very strong when cast in Ultra-Thin sections ranging from 0.03” to 0.50”(0.075cm to 1.27cm). TASK™ 4 has a very low mixed viscosity, ensuring flawless pick-up of even the finest detail. Cured plastic exhibits very low shrinkage which is why this plastic has become a favorite of prototype and design professionals throughout the world. Pot life is 20 minutes and cure time is 16 hours at 73°F/23°C.

Vibrant colors and color effects are possible by adding SO-Strong™ color tints. Fully cured models made from TASK™ 4 are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for TASK™ 4 include making prototype and architectural models, model toys, durable miniatures, ultra-thin mechanical parts and special effect props.

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