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Ecoflex™ 5

Ecoflex™ 5 vs. Smooth-Cast® ONYX™ FAST vs. Plasti-Paste® II

Super-Soft, Addition Cure Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cpsLight Paste
Pot Life1 minute2.5 minutes10 minutes
Cure Time5 minutes15 minutes90 minutes
Shore D Hardness8070
Shore A Hardness5
ColorTranslucentBlackOff White
Elongation @ Break1,000 %4 %1.14 %
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™ FASTPlasti-Paste® II
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity13,000 cps100 cpsLight Paste
Mix Ratio By Volume1A:1B100A:100B1A:2B
Mix Ratio By Weight1A:1B120A:100B62A:100B
Pot Life1 minute2.5 minutes10 minutes
Cure Time5 minutes15 minutes90 minutes
Shore D Hardness8070
Shore A Hardness5
Specific Gravity1.07 g/cc1.09 g/cc1.0 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.27.73 cu. in./lb.
ColorTranslucentBlackOff White
Die B Tear Strength75 pli
Tensile Strength350 psi5,840 psi
Tensile Modulus246,000 psi235,000 psi
Ultimate Tensile2,150 psi
Elongation @ Break1,000 %4 %1.14 %
100% Modulus15 psi
Compressive Strength8,760 psi4,980 psi
Compressive Modulus77,400 psi62,700 psi
Flexural Strength8,280 psi3,840 psi
Flexural Modulus246,000 psi203,000 psi
Shrinkage<.001 in. / in.0.010 in. / in.0.005 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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Plasti-Paste® II

New Plasti-Paste® II is a two component fiber-filled resin that is designed for vertical surface application. This no-odor formulation is an improved version of our original Plasti-Paste® formula, and the cured product is different in the following ways:

  1. Plasti-Paste II is now phthalate free.
  2. Cured plastic can be painted (original Plasti Paste® can not)
  3. It is harder, more rigid with better heat resistance.

Part A is a liquid and Part B is a paste. New Mix Ratio is 1A: 2B by volume (62A:100B by weight). Pot life is 10 minutes at room temperature depending on mass. Demold time (can be handled) is about 90 minutes at room temperature depending on mass. Full cure; 24 hours at room temperature. Cure time can be accelerated by applying heat.

Mixed material holds a vertical surface without sagging and cures to a strong, durable and lightweight plastic. Liquid material can be pigmented with So-Strong® color tints from Smooth-On. This plastic can be used for creating themed environments or special effects, used as a “mother mold” material to reinforce rubber molds and a variety of other applications. This plastic is also a powerful adhesive and can be used as a repair material for a variety of industrial applications. Cured plastic can be sanded, machined and painted with acrylic enamel paints.

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