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Ecoflex™ 5

Mold Max™ 25 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Mold Max™ 25

Mold Max™ 25 vs. Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

High Performance Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps100 cps25,000 cps
Mix Ratio By Volume1A:1B100A:100BN/A (gram scale required)
Pot Life1 minute2.5 minutes60 minutes
Cure Time5 minutes15 minutes24 hours
Shore D Hardness80
Shore A Hardness525
ColorTranslucentBlackPurple
Tensile Strength350 psi5,840 psi577 psi
Elongation @ Break1,000 %4 %375 %
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™ FASTMold Max™ 25
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Silicone Rubber - Tin Cure
Mixed Viscosity13,000 cps100 cps25,000 cps
Mix Ratio By Volume1A:1B100A:100B
Mix Ratio By Weight1A:1B120A:100B100A:5B
Pot Life1 minute2.5 minutes60 minutes
Cure Time5 minutes15 minutes24 hours
Shore D Hardness80
Shore A Hardness525
Specific Gravity1.07 g/cc1.09 g/cc1.18 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.23.5 cu. in./lb.
ColorTranslucentBlackPurple
Die B Tear Strength75 pli130 pli
Tensile Strength350 psi5,840 psi577 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %375 %
100% Modulus15 psi80 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.0.001 in. / in.
Useful Temperature (min)-65 °F-65 °F
Useful Temperature (max)450 °F400 °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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Mold Max™ 25

Mold Max™ Silicones are tin-cured silicone rubber compounds that have exceptional working properties and library life. Mold Max™ Silicones feature Smooth-On’s exclusive “Libra™” catalyst for long library life. Mold Max™ silcones can be pigmented with Silc Pig™ silicone colorants. Pot life for the Mold Max™ 25  is 60 minutes and cures overnight at room temperature.

Vacuum degassing mixed material using a vacuum pump and chamber to remove entrapped air is recommended.

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