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Ecoflex™ 5

Ecoflex™ 5 vs. Epsilon™ PRO vs. Mold Star™ 31T

Super-Soft, Addition Cure Silicone Rubber

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Epsilon™ PRO

Ecoflex™ 5 vs. Epsilon™ PRO vs. Mold Star™ 31TEcoflex™ 5

High Performance Impact Resistant EPS Foam Coating

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Mold Star™ 31T

Ecoflex™ 5 vs. Epsilon™ PRO vs. Mold Star™ 31TEcoflex™ 5 versus Epsilon™ PRO

1A:1B Mix By Volume Translucent Platinum Silicone Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy and Urethane Coatings
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps4,000 cps11,000 cps
Pot Life1 minute22 minutes5 minutes
Cure Time5 minutes16 hours23 minutes
Shore D Hardness65
Shore A Hardness530
ColorTranslucentClear AmberTranslucent
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™ PROMold Star™ 31T
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy and Urethane Coatings
  • Silicone Rubber - Platinum Cure
Mixed Viscosity13,000 cps4,000 cps11,000 cps
Mix Ratio By Volume1A:1B2A:1B1A:1B
Mix Ratio By Weight1A:1B100A:44B1A:1B
Pot Life1 minute22 minutes5 minutes
Thin Film Working Time35 minutes
Thin Film Recoat Time3 hours
Cure Time5 minutes16 hours23 minutes
Shore D Hardness65
Shore A Hardness530
Specific Gravity1.07 g/cc1.11 g/cc1.08 g/cc
Specific Volume25.8 cu. in./lb.25.0 cu. in./lb.25.6 cu. in./lb.
ColorTranslucentClear AmberTranslucent
Die B Tear Strength75 pli90 pli
Tensile Strength350 psi420 psi
Elongation @ Break1,000 %400 %
100% Modulus15 psi47 psi
Shrinkage<.001 in. / in.< .001 in. / in.
Useful Temperature (min)-65 °F-65 °F
Useful Temperature (max)450 °F450 °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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Mold Star™ 31T

Mold Star31T is an easy to use Shore 30A translucent platinum silicone that is mixed 1A:1B by volume (no weighing scale necessary). It features a relatively low viscosity and vacuum degassing is not required for most applications. Pot life is 5 minutes and cure time is 23 minutes at room temperature.

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