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PC-3®

EpoxAcast™ 690 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22

Laboratory Tabletop Epoxy Adhesive

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EpoxAcast™ 690

EpoxAcast™ 690 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22 versus PC-3®

Optically Clear Casting Epoxy

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Epoxy Casting and Laminating Resins
Mixed Viscosity11,000 cpsPaste280 cps
Mix Ratio By Volume1A:1B1A:1BN/A (gram scale required)
Pot Life5 minutes20 minutes5 hours
Cure Time45 minutes24 hours24 hours
Barcol 935 Hardness75
Shore D Hardness80
Shore A Hardness22
Specific Volume25.6 cu. in./lb.20 cu. in./lb.25 cu. in./lb.
ColorTranslucent GreenBlackClear
Tensile Strength490 psi3,000 psi6,630 psi
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®EpoxAcast™ 690
Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Epoxy Casting and Laminating Resins
Mixed Viscosity11,000 cpsPaste280 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:30B
Pot Life5 minutes20 minutes5 hours
Cure Time45 minutes24 hours24 hours
Barcol 935 Hardness75
Shore D Hardness80
Shore A Hardness22
Specific Gravity1.08 g/cc1.4 g/cc1.10 g/cc
Specific Volume25.6 cu. in./lb.20 cu. in./lb.25 cu. in./lb.
ColorTranslucent GreenBlackClear
Die B Tear Strength102 pli
Tensile Strength490 psi3,000 psi6,630 psi
Tensile Modulus572,000 psi
Elongation @ Break450 %
100% Modulus49 psi
Compressive Strength9,610 psi
Compressive Modulus91,300 psi
Flexural Strength5,000 psi10,980 psi
Flexural Modulus410,000 psi
Shrinkage<.001 in. / in.0.003 in. / in.0.002 in. / in.
Heat Deflection Temp115 °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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EpoxAcast™ 690

EpoxAcast™ 690 is a clear casting epoxy resin suitable for a variety of industrial and art-related projects requiring a rigid, clear finished casting. It is mixed 100A:30B by weight (gram scale required) and features a very low viscosity for easy mixing and minimal bubble entrapment. Working time is 5 hours and cure time is 24 hours at room temperature. Castings cure with negligible shrinkage and are very hard and strong. Resin can be colored with UVO™ or IGNITE™ colorants. This product is not moisture sensitive and can be used in humid environments. Recommended casting thickness maximum per layer is 3/8 in. / 0.95 cm.

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