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Ecoflex™ 5

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

Super-Soft, Addition Cure Silicone Rubber

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XTC-3D™

Ecoflex™ 5 vs. XTC-3D™ vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

High Performance 3D Print Coating

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy and Urethane Coatings
Mixed Viscosity13,000 cps100 cps350 cps
Shore D Hardness8080
Shore A Hardness5
ColorTranslucentBlackClear (Slightly Yellow In Thick Sections)
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™ FASTXTC-3D™
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy and Urethane Coatings
Mixed Viscosity13,000 cps100 cps350 cps
Mix Ratio By Volume1A:1B100A:100B2A:1B
Mix Ratio By Weight1A:1B120A:100B100A:42B
Pot Life1 minute2.5 minutes
Thin Film Working Time20 minutes
Thin Film Recoat Time90 minutes
Tack Free Time2 hours
Cure Time5 minutes15 minutes
Shore D Hardness8080
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.09 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.25.1 cu. in./lb.
ColorTranslucentBlackClear (Slightly Yellow In Thick Sections)
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %
100% Modulus15 psi
Compressive Strength8,760 psi
Compressive Modulus77,400 psi
Flexural Strength8,280 psi
Flexural Modulus246,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.
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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XTC-3D™

XTC-3D™ is a protective coating for smoothing and finishing 3D printed parts. Two liquids are mixed together and brushed onto any 3D print. Coating self-levels and wets out uniformly without leaving brush strokes. Working time is 10 minutes and cure time is about 4 hours (depending on mass and temperature). XTC-3D™ cures to a hard, impact resistant coating that can be sanded, primed and painted. Adding colors and metal effects is easy.

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