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PC-3®

Crystal Clear™ 221 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22

Laboratory Tabletop Epoxy Adhesive

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Crystal Clear™ 221

Crystal Clear™ 221 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22 versus PC-3®

Clear Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Resins
Mixed Viscosity11,000 cpsPaste675 cps
Mix Ratio By Volume1A:1B1A:1BN/A (gram scale required)
Pot Life5 minutes20 minutes75 minutes
Barcol 935 Hardness75
Shore D Hardness85
Shore A Hardness22
Specific Volume25.6 cu. in./lb.20 cu. in./lb.25.9 cu. in./lb.
ColorTranslucent GreenBlackClear
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

EZ-Spray® Silicone 22PC-3®Crystal Clear™ 221
Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Resins
Mixed Viscosity11,000 cpsPaste675 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:75B
Pot Life5 minutes20 minutes75 minutes
Cure Time45 minutes24 hours

Overnight Followed By Post Cure

Barcol 935 Hardness75
Shore D Hardness85
Shore A Hardness22
Specific Gravity1.08 g/cc1.4 g/cc1.07 g/cc
Specific Volume25.6 cu. in./lb.20 cu. in./lb.25.9 cu. in./lb.
ColorTranslucent GreenBlackClear
Die B Tear Strength102 pli
Tensile Strength490 psi3,000 psi
Tensile Modulus286,000 psi
Ultimate Tensile8,190 psi
Elongation @ Break450 %12 %
100% Modulus49 psi
Compressive Strength10,100 psi
Compressive Modulus87,000 psi
Flexural Strength5,000 psi11,400 psi
Flexural Modulus305,000 psi
Shrinkage<.001 in. / in.0.003 in. / in.0.0173 in. / in.
Heat Deflection Temp176 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)500 °F
Compressive Yield Strength5,000 psi

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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PC-3®

Smooth-On PC-3® Laboratory Table Top Cement is a two-component, black epoxy resin compound designed to join, bond and caulk sections of laboratory counters and tables. This epoxy resin cement is heavily filled and will adhere to vertical surfaces without sagging. It cures at room temperature with extremely low shrinkage.

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Crystal Clear™ 221

Crystal Clear™ 221 is a water white clear resin made specifically for applications that require absolute clarity. This is a “heat cure” system and a harder version 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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Silicone Rubber - Tin Cure ›

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Polymer Modifiers for Concrete and Gypsum ›