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PC-3®

TASK™ 21 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22

Laboratory Tabletop Epoxy Adhesive

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TASK™ 21

TASK™ 21 vs. EZ-Spray® Silicone 22 vs. PC-3®EZ-Spray® Silicone 22 versus PC-3®

High Performance Urethane Casting Resin

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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Resins
Mixed Viscosity11,000 cpsPaste500 cps
Pot Life5 minutes20 minutes6 minutes
Cure Time45 minutes24 hours1 hour
Barcol 935 Hardness75
Shore D Hardness75
Shore A Hardness22
Specific Volume25.6 cu. in./lb.20 cu. in./lb.25.9 cu. in./lb.
ColorTranslucent GreenBlackWhite
Tensile Strength490 psi3,000 psi5,500 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®TASK™ 21
Product Type
  • Silicone Rubber - Platinum Cure
  • Adhesives
  • Urethane Resins
Mixed Viscosity11,000 cpsPaste500 cps
Mix Ratio By Volume1A:1B1A:1B2A:1B
Mix Ratio By Weight1A:1B2A:1B
Pot Life5 minutes20 minutes6 minutes
Cure Time45 minutes24 hours1 hour
Barcol 935 Hardness75
Shore D Hardness75
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 GreenBlackWhite
Die B Tear Strength102 pli
Tensile Strength490 psi3,000 psi5,500 psi
Tensile Modulus270,000 psi
Elongation @ Break450 %7.5 %
100% Modulus49 psi
Compressive Strength7,100 psi
Compressive Modulus78,500 psi
Flexural Strength5,000 psi7,100 psi
Flexural Modulus250,000 psi
Shrinkage<.001 in. / in.0.003 in. / in.0.0058 in. / in.
Heat Deflection Temp144 °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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TASK™ 21

TASK™ 21 is a performance urethane casting resin that has been described by many as having similar performance and mechanical characteristics to ABS plastic, with high compressive and flexural strength. TASK 21 has no odor and is easy to process. Mix ratio is 2A:1B by weight or volume. Pot life is 6 minutes and handling strength is reached in 60 minutes at room temperature (depending on mass and configuration).

TASK 21 features a low mixed viscosity of 500 cps and readily de-airs itself when cast into molds. SO-Strong™ or IGNITE™ colorants can be added for color and a variety of powder fillers can be added to alter performance or appearance characteristics. Applications for TASK 21 include rapid prototyping, casting strong and highly detailed models, making holding / assembly fixtures, figurines and decorative castings.

IMPORTANT - TASK 21 can not be cast into platinum-cure silicone molds. We recommend casting TASK 21 into tin-cure silicone or urethane rubber molds (using a release agent).

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Silicone Rubber - Tin Cure ›

Silicone Rubber - Platinum Cure ›

Urethane Rubber ›

Polysulfide Rubber ›

Urethane Resins ›

Epoxy Casting and Laminating Resins ›

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Epoxy and Urethane Coatings ›

Mix and Pour Expanding Foams ›

Adhesives ›

Lifecasting Materials ›

Skin Safe FX Materials ›

Polymer Modifiers for Concrete and Gypsum ›