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Crystal Clear™ 221

Crystal Clear™ 221 vs. EZ-Spray® Silicone 22EZ-Spray® Silicone 22

Clear Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity11,000 cps675 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life5 minutes75 minutes
Shore D Hardness85
Shore A Hardness22
ColorTranslucent GreenClear
Elongation @ Break450 %12 %
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

EZ-Spray® Silicone 22Crystal Clear™ 221
Product Type
  • Silicone Rubber - Platinum Cure
  • Urethane Resins
Mixed Viscosity11,000 cps675 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight100A:75B
Pot Life5 minutes75 minutes
Cure Time45 minutes

Overnight Followed By Post Cure

Shore D Hardness85
Shore A Hardness22
Specific Gravity1.08 g/cc1.07 g/cc
Specific Volume25.6 cu. in./lb.25.9 cu. in./lb.
ColorTranslucent GreenClear
Die B Tear Strength102 pli
Tensile Strength490 psi
Tensile Modulus286,000 psi
Ultimate Tensile8,190 psi
Elongation @ Break450 %12 %
100% Modulus49 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)500 °F

Product Description

EZ-Spray® Silicone 22

EZ~Spray® Silicone 22 are sprayable silicones which cure quickly to soft rubbers with high elongation and tear strength. Liquid silicone is sprayed through the EZ~Spray® Junior Cartridge System which is an economical alternative to expensive spray equipment. After a suitable thickness is attained, EZ~Spray® Silicone 22 cures in about 45 minutes. EZ~Spray® Silicone cures with negligible shrinkage to strong, durable silicone rubbers good for production casting of polyester, epoxy or urethane resins, gypsum, concrete and other materials.

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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.

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