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Ecoflex™ 5

Ecoflex™ 5 vs. PMC®-780 WET vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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PMC®-780 WET

Ecoflex™ 5 vs. PMC®-780 WET vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Tough, Rigid, Industrial Rubber Compound

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps100 cps2,000 cps
Pot Life1 minute2.5 minutes25 minutes
Cure Time5 minutes15 minutes48 hours
Shore D Hardness80
Shore A Hardness580
ColorTranslucentBlackLight Amber
Tensile Strength350 psi5,840 psi900 psi
Elongation @ Break1,000 %4 %750 %
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™ FASTPMC®-780 WET
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps100 cps2,000 cps
Mix Ratio By Volume1A:1B100A:100B2A:1B
Mix Ratio By Weight1A:1B120A:100B2A:1B
Pot Life1 minute2.5 minutes25 minutes
Cure Time5 minutes15 minutes48 hours
Shore D Hardness80
Shore A Hardness580
Specific Gravity1.07 g/cc1.09 g/cc1.02 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.27.2 cu. in./lb.
ColorTranslucentBlackLight Amber
Die B Tear Strength75 pli
Die C Tear Strength200 pli
Tensile Strength350 psi5,840 psi900 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %750 %
100% Modulus15 psi400 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.<.001 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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PMC®-780 WET

PMC-780 is a premium performance urethane rubber that offers exceptional strength, durability and abrasion resistance. PMC-780 DOES NOT CONTAIN MOCA – a known cancer causing agent and hazard. Mixed two parts A to one part B by weight or volume, PMC-780 urethane pours easily and cures at room temperature with negligible shrinkage to a solid Shore 80A rubber.

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