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Ecoflex™ 5

Ecoflex™ 5 vs. Crystal Clear™ 204 vs. Epsilon™ PRO

Super-Soft, Addition Cure Silicone Rubber

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Epsilon™ PRO

Ecoflex™ 5 vs. Crystal Clear™ 204 vs. Epsilon™ PROEcoflex™ 5

High Performance Impact Resistant EPS Foam Coating

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Crystal Clear™ 204

Ecoflex™ 5 vs. Crystal Clear™ 204 vs. Epsilon™ PROEcoflex™ 5 versus Epsilon™ PRO

Clear Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy and Urethane Coatings
  • Urethane Resins
Mixed Viscosity13,000 cps4,000 cps600 cps
Mix Ratio By Volume1A:1B2A:1BN/A (gram scale required)
Pot Life1 minute22 minutes2 hours
Cure Time5 minutes16 hours48 hours
Shore D Hardness6580
Shore A Hardness5
ColorTranslucentClear AmberClear
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™ PROCrystal Clear™ 204
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy and Urethane Coatings
  • Urethane Resins
Mixed Viscosity13,000 cps4,000 cps600 cps
Mix Ratio By Volume1A:1B2A:1B
Mix Ratio By Weight1A:1B100A:44B100A:90B
Pot Life1 minute22 minutes2 hours
Thin Film Working Time35 minutes
Thin Film Recoat Time3 hours
Cure Time5 minutes16 hours48 hours
Shore D Hardness6580
Shore A Hardness5
Specific Gravity1.07 g/cc1.11 g/cc1.036 g/cc
Specific Volume25.8 cu. in./lb.25.0 cu. in./lb.26.7 cu. in./lb.
ColorTranslucentClear AmberClear
Die B Tear Strength75 pli
Tensile Strength350 psi3,500 psi
Elongation @ Break1,000 %10 %
100% Modulus15 psi
Compressive Strength4,200 psi
Compressive Modulus44,000 psi
Flexural Strength5,390 psi
Flexural Modulus183,200 psi
Shrinkage<.001 in. / in.0.002 in. / in.
Heat Deflection Temp120 °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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Crystal Clear™ 204

Crystal Clear™ 204 is a water white clear and made specifically for applications that require clarity. These rigid urethane casting resins differ only in working and demold times. Low viscosity ensures easy mixing and pouring. Crystal Clear resins cure at room temperature* with negligible shrinkage.

CAUTION: NOT FOR HOME USE. THIS PRODUCT IS FOR INDUSTRIAL USE ONLY. With adequate local exhaust ventilation, respiratory protection is not normally required when using this product. Where risk assessment shows air-purifying respirators are appropriate, follow OSHA respirator regulations and European Standards EN 141, 143 and 371. Protective clothing (gloves and long sleeves) is required to minimize the risk of dermal sensitization. If breathing is affected or a dermal rash develops, immediately cease using this product and seek medical attention. Read SDS before using.

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