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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 6

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 6

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 6Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Low Cost, High Performance

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps800 cps
Pot Life1 minute2.5 minutes7 minutes
Cure Time5 minutes15 minutes75 minutes
Shore D Hardness8075
Shore A Hardness5
ColorTranslucentBlackTan
Tensile Strength350 psi5,840 psi5,200 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™ 6
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps800 cps
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B1A:1B
Pot Life1 minute2.5 minutes7 minutes
Cure Time5 minutes15 minutes75 minutes
Shore D Hardness8075
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentBlackTan
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi5,200 psi
Tensile Modulus246,000 psi146,000 psi
Elongation @ Break1,000 %4 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi5,570 psi
Compressive Modulus77,400 psi65,000 psi
Flexural Strength8,280 psi6,200 psi
Flexural Modulus246,000 psi182,500 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.0031 in. / in.
Heat Deflection Temp162 °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™ 6

TASK™ 6 low cost, high performance casting resin yields castings that are tan and virtually bubble free. This resin offers superior physical and performance properties compared to our popular Smooth-Cast™ Series of general purpose casting resins. Vacuum degassing is not necessary and it offers the convenience of a 1A:1B by volume or weight mix ratio.

TASK™ 6 has high tensile and flexural strength, as well as high flexural modulus. This plastic was formulated for a variety of industrial applications including pattern making and making prototype models. This resin is designed for casting in thicknesses up to ½” (1.27 cm).

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