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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 3

Super-Soft, Addition Cure Silicone Rubber

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TASK™ 3

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. TASK™ 3Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Performance Casting Resins

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps150 cps
Pot Life1 minute2.5 minutes20 minutes
Cure Time5 minutes15 minutes90 minutes
Shore D Hardness8080
Shore A Hardness5
ColorTranslucentBlackWhite
Tensile Strength350 psi5,840 psi6,650 psi
Elongation @ Break1,000 %4 %6 %
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™ 3
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps150 cps
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B115A:100B
Pot Life1 minute2.5 minutes20 minutes
Cure Time5 minutes15 minutes90 minutes
Shore D Hardness8080
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.
ColorTranslucentBlackWhite
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi6,650 psi
Tensile Modulus246,000 psi290,000 psi
Elongation @ Break1,000 %4 %6 %
100% Modulus15 psi
Compressive Strength8,760 psi8,300 psi
Compressive Modulus77,400 psi78,000 psi
Flexural Strength8,280 psi9,500 psi
Flexural Modulus246,000 psi288,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.0025 in. / in.
Heat Deflection Temp134 °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™ 3

TASK™ 3 low viscosity, high performance casting 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 (115A:100B by weight) mix ratio.

TASK™ 3 is white. It 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). TASK™ Plastics are moderately priced and are available in trial kits, one-gallon, five-gallon, 55-gallon drum and totes.

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