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PC-3®

Smooth-Cast® 321 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22

Laboratory Tabletop Epoxy Adhesive

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Smooth-Cast® 321

Smooth-Cast® 321 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22 versus PC-3®

Off-White, Ultra Low Viscosity Liquid Plastics

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Resins
Mixed Viscosity11,000 cpsPaste80 cps
Pot Life5 minutes20 minutes9 minutes
Cure Time45 minutes24 hours30 minutes
Barcol 935 Hardness75
Shore D Hardness70
Shore A Hardness22
Specific Volume25.6 cu. in./lb.20 cu. in./lb.26.4 cu. in./lb.
ColorTranslucent GreenBlackOff White
Tensile Strength490 psi3,000 psi3,000 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®Smooth-Cast® 321
Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Resins
Mixed Viscosity11,000 cpsPaste80 cps
Mix Ratio By Volume1A:1B1A:1B1A:1B
Mix Ratio By Weight1A:1B100A:90B
Pot Life5 minutes20 minutes9 minutes
Cure Time45 minutes24 hours30 minutes
Barcol 935 Hardness75
Shore D Hardness70
Shore A Hardness22
Specific Gravity1.08 g/cc1.4 g/cc1.05 g/cc
Specific Volume25.6 cu. in./lb.20 cu. in./lb.26.4 cu. in./lb.
ColorTranslucent GreenBlackOff White
Die B Tear Strength102 pli
Tensile Strength490 psi3,000 psi3,000 psi
Tensile Modulus138,000 psi
Elongation @ Break450 %8 %
100% Modulus49 psi
Compressive Strength3,550 psi
Compressive Modulus40,300 psi
Flexural Strength5,000 psi3,500 psi
Flexural Modulus110,000 psi
Shrinkage<.001 in. / in.0.003 in. / in.0.007 in. / in.
Heat Deflection Temp140 °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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Smooth-Cast® 321

The Smooth-Cast® 320 Series consists of ultra-low viscosity casting resins that yield virtually bubble-free off-white castings. The Smooth-Cast® 320 resins are sister products to our popular Smooth-Cast® 300 Series of bright white plastics, but are easier to color using SO-Strong® or Ignite® color tints. Smooth-Cast® 320 series is easy to mix and pour, offering the convenience of a 1A:1B by volume or 100A : 90B by weight mix ratio.

The Smooth-Cast® 320 Series resins readily accept pigments and fillers (such as URE-FIL® 3, 5 and 7 from Smooth-On). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 320 Series resins include reproducing small to medium size sculptures, making prototype models, special effect props, decorative jewelry and taxidermy (bones, antlers, teeth etc.).

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Select a Material from a Category Below

Silicone Rubber - Tin Cure ›

Silicone Rubber - Platinum Cure ›

Urethane Rubber ›

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Adhesives ›

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