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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Feather Lite™

Super-Soft, Addition Cure Silicone Rubber

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Feather Lite™

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Feather Lite™Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Lightweight Urethane Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps410 cps
Pot Life1 minute2.5 minutes8.5 minutes
Cure Time5 minutes15 minutes2 hours
Shore D Hardness8058
Shore A Hardness5
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.41.3 cu. in./lb.
ColorTranslucentBlackBeige
Elongation @ Break1,000 %4 %1.6 %
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™ FASTFeather Lite™
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cps410 cps
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B
Pot Life1 minute2.5 minutes8.5 minutes
Cure Time5 minutes15 minutes2 hours
Shore D Hardness8058
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc0.67 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.41.3 cu. in./lb.
ColorTranslucentBlackBeige
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi156,000 psi
Ultimate Tensile2,160 psi
Elongation @ Break1,000 %4 %1.6 %
100% Modulus15 psi
Compressive Strength8,760 psi3,070 psi
Compressive Modulus77,400 psi53,700 psi
Flexural Strength8,280 psi3,440 psi
Flexural Modulus246,000 psi164,300 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.003 in. / in.
Heat Deflection Temp140 °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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Feather Lite™

Feather Lite™ is a heavily filled low-density urethane casting resin. Cured plastic is lightweight (it floats in water!) and has a much lower density than other casting resins.

Feather Lite™ features a convenient 1A:1B by volume mix ratio and mixes easily (pre-mixing of parts A & B is necessary). Cured plastic is strong and can be carved, machined, drilled, sanded, etc. Feather Lite™ can be pigmented with SO-Strong™ color tints prior to casting and finished castings can be painted. And because this product is low-density, it yields more plastic per pound/kg. than other casting resins, the cost per casting is low. Feather Lite™ can be used for a variety of art or industrial design related applications including reproducing sculpture, making fishing lures, prototype model making, casting doll heads and figures, etc.

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