Compare Tool

remove

Ecoflex™ 5

Ecoflex™ 5 vs. Crystal Clear™ 221

Super-Soft, Addition Cure Silicone Rubber

 View Product

Vs.
remove

Crystal Clear™ 221

Ecoflex™ 5 vs. Crystal Clear™ 221Ecoflex™ 5

Clear Urethane Casting Resin

 View Product

Add Material to Compare

start over

Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps675 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life1 minute75 minutes
Shore D Hardness85
Shore A Hardness5
ColorTranslucentClear
Elongation @ Break1,000 %12 %
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™ 5Crystal Clear™ 221
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity13,000 cps675 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:75B
Pot Life1 minute75 minutes
Cure Time5 minutes

Overnight Followed By Post Cure

Shore D Hardness85
Shore A Hardness5
Specific Gravity1.07 g/cc1.07 g/cc
Specific Volume25.8 cu. in./lb.25.9 cu. in./lb.
ColorTranslucentClear
Die B Tear Strength75 pli
Tensile Strength350 psi
Tensile Modulus286,000 psi
Ultimate Tensile8,190 psi
Elongation @ Break1,000 %12 %
100% Modulus15 psi
Compressive Strength10,100 psi
Compressive Modulus87,000 psi
Flexural Strength11,400 psi
Flexural Modulus305,000 psi
Shrinkage<.001 in. / in.0.0173 in. / in.
Heat Deflection Temp176 °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.

Read More

Crystal Clear™ 221

Crystal Clear™ 221 is a water white clear resins made specifically for applications that require absolute clarity. These are “heat cure” systems and are harder versions of our popular Crystal Clear™ Series resins (Shore 85D).

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.

Read More

Select a Material from a Category Below

Silicone Rubber - Tin Cure ›

Silicone Rubber - Platinum Cure ›

Urethane Rubber ›

Polysulfide Rubber ›

Urethane Resins ›

Epoxy Casting and Laminating Resins ›

Epoxy Putties ›

Epoxy and Urethane Coatings ›

Mix and Pour Expanding Foams ›

Adhesives ›

Lifecasting Materials ›

Skin Safe FX Materials ›

Polymer Modifiers for Concrete and Gypsum ›