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PC-3®

PMC®-746 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22

Laboratory Tabletop Epoxy Adhesive

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PMC®-746

PMC®-746 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22 versus PC-3®

Polyurethane Rubber Compound

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Rubber
Mixed Viscosity11,000 cpsPaste1,200 cps
Pot Life5 minutes20 minutes15 minutes
Cure Time45 minutes24 hours16 hours
Barcol 935 Hardness75
Shore A Hardness2260
Specific Volume25.6 cu. in./lb.20 cu. in./lb.26.9 cu. in./lb.
ColorTranslucent GreenBlackAmber
Tensile Strength490 psi3,000 psi700 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®PMC®-746
Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Rubber
Mixed Viscosity11,000 cpsPaste1,200 cps
Mix Ratio By Volume1A:1B1A:1B2A:1B
Mix Ratio By Weight1A:1B2A:1B
Pot Life5 minutes20 minutes15 minutes
Cure Time45 minutes24 hours16 hours
Barcol 935 Hardness75
Shore A Hardness2260
Specific Gravity1.08 g/cc1.4 g/cc1.03 g/cc
Specific Volume25.6 cu. in./lb.20 cu. in./lb.26.9 cu. in./lb.
ColorTranslucent GreenBlackAmber
Die B Tear Strength102 pli
Die C Tear Strength100 pli
Tensile Strength490 psi3,000 psi700 psi
Elongation @ Break450 %650 %
100% Modulus49 psi220 psi
Flexural Strength5,000 psi
Shrinkage<.001 in. / in.0.003 in. / in.< .001 in. / in.
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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PMC®-746

PMC®-746 was developed to make molds for casting gypsum plasters. This product is well suited for use as a rubber case mold – especially large case molds where extra rigidity is required. Shore hardness is 60A. Because of its durability and moisture resistant properties PMC®-746 is also used by zoos and museums for a variety of mold-making, display and exhibit applications. It features a convenient mix ratio (2:1 by weight or volume), and contains no mercury.

Other applications include making plaster block molds, reproducing ornamental plaster (architectural restoration), pre-cast concrete molds, casting waxes, Smooth-On rigid polyurethanes and epoxies and also for making a variety of special effects for movies and theatre.

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Silicone Rubber - Tin Cure ›

Silicone Rubber - Platinum Cure ›

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Adhesives ›

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Polymer Modifiers for Concrete and Gypsum ›