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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. MT-13®

Super-Soft, Addition Cure Silicone Rubber

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MT-13®

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. MT-13®Ecoflex™ 5 versus Smooth-Cast® ONYX™ FAST

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps100 cpsLight Paste
Pot Life1 minute2.5 minutes35 minutes
Cure Time5 minutes15 minutes16 hours
Barcol 935 Hardness72
Shore D Hardness80
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.37 g/cc
ColorTranslucentBlackWhite
Tensile Strength350 psi5,840 psi4,300 psi
Elongation @ Break1,000 %4 %0.8 %
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™ FASTMT-13®
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Adhesives
Mixed Viscosity13,000 cps100 cpsLight Paste
Mix Ratio By Volume1A:1B100A:100B1A:1B
Mix Ratio By Weight1A:1B120A:100B100A:123B
Pot Life1 minute2.5 minutes35 minutes
Cure Time5 minutes15 minutes16 hours
Barcol 935 Hardness72
Shore D Hardness80
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.37 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.
ColorTranslucentBlackWhite
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi4,300 psi
Tensile Modulus246,000 psi285,000 psi
Elongation @ Break1,000 %4 %0.8 %
100% Modulus15 psi
Compressive Strength8,760 psi8,700 psi
Compressive Modulus77,400 psi165,000 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
Sag Resistance1/16 in.
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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MT-13®

Smooth-On MT-13® is a premium performance epoxy for applications requiring maximum holding power and water resistance. MT-13® is a two component epoxy adhesive cement which is mixed in equal parts by volume (100A/123B by weight) Pot Life is 35 minutes and handling strength develops in 16 hours at 73° F / 23° C. MT-13® adheres extremely well to both porous and non-porous surfaces. MT-13® is widely used by the boating industry for assembly and general repair. MT-13® also maintains holding power under extreme cold conditions.

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