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Ecoflex™ 5

Ecoflex™ 5 vs. Plasti-Paste® II vs. Epsilon™ PRO

Super-Soft, Addition Cure Silicone Rubber

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Epsilon™ PRO

Ecoflex™ 5 vs. Plasti-Paste® II vs. Epsilon™ PROEcoflex™ 5

High Performance Impact Resistant EPS Foam Coating

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy and Urethane Coatings
  • Urethane Resins
Mixed Viscosity13,000 cps4,000 cpsLight Paste
Pot Life1 minute22 minutes10 minutes
Cure Time5 minutes16 hours90 minutes
Shore D Hardness6570
Shore A Hardness5
ColorTranslucentClear AmberOff White
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™ 5Epsilon™ PROPlasti-Paste® II
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy and Urethane Coatings
  • Urethane Resins
Mixed Viscosity13,000 cps4,000 cpsLight Paste
Mix Ratio By Volume1A:1B2A:1B1A:2B
Mix Ratio By Weight1A:1B100A:44B62A:100B
Pot Life1 minute22 minutes10 minutes
Thin Film Working Time35 minutes
Thin Film Recoat Time3 hours
Cure Time5 minutes16 hours90 minutes
Shore D Hardness6570
Shore A Hardness5
Specific Gravity1.07 g/cc1.11 g/cc1.0 g/cc
Specific Volume25.8 cu. in./lb.25.0 cu. in./lb.27.73 cu. in./lb.
ColorTranslucentClear AmberOff White
Die B Tear Strength75 pli
Tensile Strength350 psi
Tensile Modulus235,000 psi
Ultimate Tensile2,150 psi
Elongation @ Break1,000 %1.14 %
100% Modulus15 psi
Compressive Strength4,980 psi
Compressive Modulus62,700 psi
Flexural Strength3,840 psi
Flexural Modulus203,000 psi
Shrinkage<.001 in. / in.0.005 in. / in.
Heat Deflection Temp130 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °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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Epsilon™ PRO

Epsilon™ PRO is a thixotropic epoxy coating that self-thickens for brushing onto a variety of surfaces.  Compared to original Epsilon™, Epsilon™ PRO offers a longer working time and cured epoxy is semi-rigid, offering better impact resistance.  Mix ratio for Epsilon™ PRO is 2A:1B by volume (100A:44B by weight).  A gram scale is not needed to use this product.

Applied in thin layers, mixed material holds a vertical surface without sagging or slumping. Material wets out uniformly over different surfaces.  Pot life is 22 minutes, with a re-coat time of 3 hours.  All layers should be allowed to cure for 16 hours at 73° F / 23° C and can be accelerated with mild heat.  Epsilon™ PRO is clear and can be easily colored using Ignite™ or UVO™ colorants.  Cured coating has a gloss finish and can be sanded, primed and painted.

Applications: Epsilon™ PRO is suitable for use as a protective, impact resistant coating for EPS or polyurethane foam. It can also be applied to plaster, concrete, wood and fabrics. This product is not sensitive to moisture / humidity and contains no VOC’s. 

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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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Polymer Modifiers for Concrete and Gypsum ›