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Key Differences

Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
Mixed Viscosity11,000 cps6,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life5 minutes3 hours
Cure Time45 minutes24 hours
Shore D Hardness90
Shore A Hardness22
ColorTranslucent GreenBeige
Tensile Strength490 psi4,500 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 22EpoxAcast™ 670 HT
Product Type
  • Silicone Rubber - Platinum Cure
  • Epoxy Casting and Laminating Resins
Mixed Viscosity11,000 cps6,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight100A:16B
Pot Life5 minutes3 hours
Cure Time45 minutes24 hours
Shore D Hardness90
Shore A Hardness22
Specific Gravity1.08 g/cc1.15 g/cc
Specific Volume25.6 cu. in./lb.20.51 cu. in./lb.
ColorTranslucent GreenBeige
Die B Tear Strength102 pli
Tensile Strength490 psi4,500 psi
Tensile Modulus332,000 psi
Elongation @ Break450 %
100% Modulus49 psi
Compressive Strength13,000 psi
Compressive Modulus101,400 psi
Flexural Strength11,000 psi
Flexural Modulus254,000 psi
Shrinkage<.001 in. / in.0.002 in. / in.
Heat Deflection Temp350 °F
Useful Temperature (min)-65 °F
Useful Temperature (max)500 °F

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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EpoxAcast™ 670 HT

EpoxAcast670 HT (formerly 20-136) is an epoxy casting compound which offers high heat resistance up to 350° F/177° C if post cure schedule is used. EpoxAcast™ 670 HT is ideal for making vacuum form molds, foundry patterns, forming dies & fixtures, hard rollers, industrial parts and high impact tools. EpoxAcast™ 670 HT is also suitable for encapsulation applications or for use as a high temperature epoxy for bonding a variety of surfaces.

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