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Ecoflex™ 5

Ecoflex™ 5 vs. Clear Flex™ 95 vs. Smooth-Cast® ONYX™ FAST

Super-Soft, Addition Cure Silicone Rubber

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Clear Flex™ 95

Ecoflex™ 5 vs. Clear Flex™ 95 vs. Smooth-Cast® ONYX™ FASTEcoflex™ 5 versus Smooth-Cast® ONYX™ FAST

Water Clear Urethane Rubber

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps100 cps250 cps
Pot Life1 minute2.5 minutes25 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness80
Shore A Hardness595
ColorTranslucentBlackClear
Tensile Strength350 psi5,840 psi2,500 psi
Elongation @ Break1,000 %4 %175 %
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™ FASTClear Flex™ 95
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
  • Urethane Rubber
Mixed Viscosity13,000 cps100 cps250 cps
Mix Ratio By Volume1A:1B100A:100BN/A
Mix Ratio By Weight1A:1B120A:100B1A:1.5B
Pot Life1 minute2.5 minutes25 minutes
Cure Time5 minutes15 minutes16 hours
Shore D Hardness80
Shore A Hardness595
Specific Gravity1.07 g/cc1.09 g/cc1.04 g/cc
Specific Volume25.8 cu. in./lb.27.7 cu. in./lb.26.8 cu. in./lb.
ColorTranslucentBlackClear
Die B Tear Strength75 pli
Die C Tear Strength200 pli
Tensile Strength350 psi5,840 psi2,500 psi
Tensile Modulus246,000 psi
Elongation @ Break1,000 %4 %175 %
100% Modulus15 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.0.0028 in. / in.
Useful Temperature (min)-65 °F
Useful Temperature (max)450 °F
Volume Resistance>7.646E+13 ohm
Volume Resistivity>6.014E+15 ohm/cm
Dielectric Constant, 100Hz6.62
Dielectric Strength474 volts/mil
Heat Deflection With Post Cure250 °F
Dissipation Factor, 100Hz0.103

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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Clear Flex™ 95

Clear Flex™ 95 is a water white clear urethane liquid rubber compounds designed for applications that require absolute clarity and resistance to sunlight. Low viscosity ensures easy mixing and pouring. Clear Flex™ 95 cures 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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Select a Material from a Category Below

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