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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. EZ-Spray™ Styrocoat™

Super-Soft, Addition Cure Silicone Rubber

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EZ-Spray™ Styrocoat™

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. EZ-Spray™ Styrocoat™Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Flame Rated Sprayable Plastic Coating

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy and Urethane Coatings
Mixed Viscosity13,000 cps100 cpsVariable
Pot Life1 minute2.5 minutes2 seconds
Cure Time5 minutes15 minutes60 minutes
Shore D Hardness8080
Shore A Hardness5
ColorTranslucentBlackOff White
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™ FASTEZ-Spray™ Styrocoat™
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Epoxy and Urethane Coatings
Mixed Viscosity13,000 cps100 cpsVariable
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B
Pot Life1 minute2.5 minutes2 seconds
Cure Time5 minutes15 minutes60 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.
ColorTranslucentBlackOff White
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi131,000 psi
Ultimate Tensile3,170 psi
Elongation @ Break1,000 %4 %20 %
100% Modulus15 psi
Compressive Strength8,760 psi5,000 psi
Compressive Modulus77,400 psi47,600 psi
Flexural Strength8,280 psi6,400 psi
Flexural Modulus246,000 psi205,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.015 in. / in.
Heat Deflection Temp130 °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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EZ-Spray™ Styrocoat™

StyroCoat™ Plastic is a flame rated (E-84) sprayable polyurethane plastic formulated to economically coat a variety of surfaces. Dispensed through Smooth-On’s EZ~Spray™, Jr. cartridge system, the plastic cures in about 2 seconds and can be applied to vertical surfaces without running off. An advantage of the system is that large areas can be covered in a short period of time. Cured plastic is lightweight, flame, impact, and water resistant. It can be sanded for priming and painting. Plastic can also be sprayed into a rubber mold to make fast, impact resistant castings (application of a release agent may be necessary before spraying into the mold). StyroCoat™ Plastic is used for theme design / fabrication applications, making movie set environments, making surfaces water resistant and other industrial applications.

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Silicone Rubber - Tin Cure ›

Silicone Rubber - Platinum Cure ›

Urethane Rubber ›

Polysulfide Rubber ›

Urethane Resins ›

Epoxy Casting and Laminating Resins ›

Epoxy Putties ›

Epoxy and Urethane Coatings ›

Mix and Pour Expanding Foams ›

Adhesives ›

Lifecasting Materials ›

Skin Safe FX Materials ›

Polymer Modifiers for Concrete and Gypsum ›