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EpoxAcast™ 670 HT

EpoxAcast™ 670 HT vs. Free Form™ AIRFree Form™ AIR

High Temp Castable Epoxy Resin

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Key Differences

Product Type
  • Epoxy Putties
  • Epoxy Casting and Laminating Resins
Mixed ViscosityDough6,000 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Shore D Hardness5090
Specific Volume61.6 cu. in./lb.20.51 cu. in./lb.
ColorGreyBeige
Heat Deflection Temp140 °F350 °F
Disclaimer
Although we do our best to ensure accuracy, Smooth-On offers no warranties, promises, and/or representations of any kind, either expressed or implied, as to the accuracy, completeness, or reliability of the information contained on this Compare Tool, nor suitability of the information contained herein to your particular circumstances. Smooth-On assumes no liability for losses or damages of whatever nature (direct, indirect, consequential or other) associated with your use, or inability to use, the Compare Tool, or from your use (or failure to use) the information contained herein. Other useful tools include product technical bulletins and our extensive FAQ section. You can also contact our technical support team.

All Technical Data

Free Form™ AIREpoxAcast™ 670 HT
Product Type
  • Epoxy Putties
  • Epoxy Casting and Laminating Resins
Mixed ViscosityDough6,000 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight1A:1B100A:16B
Pot Life3 hours
Cure Time

Twenty Four Hours Followed By Post Cures

Shore D Hardness5090
Specific Gravity0.45 g/cc1.15 g/cc
Specific Volume61.6 cu. in./lb.20.51 cu. in./lb.
ColorGreyBeige
Tensile Strength4,500 psi
Tensile Modulus332,000 psi
Tensile Elongation0.65 %
Compressive Strength13,000 psi
Compressive Modulus101,400 psi
Flexural Strength11,000 psi
Flexural Modulus254,000 psi
Shrinkage0.002 in. / in.
Heat Deflection Temp140 °F350 °F
Buoyant Force10.4 lb/ft³

Product Description

Free Form™ AIR

Free Form™AIR is an extremely lightweight epoxy putty suitable for an infinite variety of industrial and art-related applications. This is a low-odor, low shrinkage putty that is unique, inexpensive and easy to use. Free Form™AIR is mixed by hand with a 1A:1B by volume or weight mix ratio. It offers a long working time and cures overnight at room temperature to a hard, rigid epoxy that is very strong. Cured Free Form™AIR is so lightweight, it will float in water. It can be sanded, shaped, and drilled. It will readily accept any paint. Free Form can also be color pigmented with UVO™ or Ignite™ colorants.

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EpoxAcast™ 670 HT

EpoxAcast™ 670 HT is an easy-to-use epoxy casting compound that offers high heat resistance up to 350°F/177°C (post cure required). EpoxAcast™ 670 HT is ideal for making vacuum forming and thermoforming molds, creating 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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