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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 15

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 15

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 15Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Roto Casting, Impact Resistant Performance Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps600 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes6 minutes
Cure Time5 minutes15 minutes1 hour
Shore D Hardness8075
Shore A Hardness5
ColorTranslucentBlackOpaque White
Tensile Strength350 psi5,840 psi2,720 psi
Elongation @ Break1,000 %4 %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™ 5Smooth-Cast® ONYX™ FASTTASK™ 15
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps600 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B75A:100B
Pot Life1 minute2.5 minutes6 minutes
Cure Time5 minutes15 minutes1 hour
Shore D Hardness8075
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.12 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.24.7 cu. in./lb.
ColorTranslucentBlackOpaque White
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi2,720 psi
Tensile Modulus246,000 psi126,000 psi
Elongation @ Break1,000 %4 %20 %
100% Modulus15 psi
Compressive Strength8,760 psi5,450 psi
Compressive Modulus77,400 psi60,000 psi
Flexural Strength8,280 psi
Flexural Modulus246,000 psi170,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.0042 in. / in.
Heat Deflection Temp117 °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™ 15

TASK™ 15 is a premium performance urethane resin that has very high impact strength, even when cast in thin-wall sections. Pot life is 6 minutes and handling time 60 minutes at room temperature. Resin cures with negligible shrinkage.

Vibrant colors are possible by adding small amounts of SO-Strong™ tint, UVO pigments or IGNITE™ fluorescent colors.

Plastic fully cures with negligible shrinkage and can be machined, sanded and/or painted. TASK™ 15 features a gradual cure profile, making it ideal for rotational casting applications (making hollow parts).

Applications include making very tough prototype parts and limited run production castings as well as rotationally cast parts such as mannequins.

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