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Free Form™ AIR HT

Smooth-Cast™ ONYX™ FAST vs. Free Form™ AIR HT

High Temperature Epoxy Dough

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Key Differences

Product Type
  • Epoxy Putties
  • Urethane Resins
Mixed ViscosityDough100 cps
Pot Life150 minutes2.5 minutes
Cure Time16 hours15 minutes
Shore D Hardness5580
Specific Volume54.31 cu. in./lb.27.7 cu. in./lb.
ColorGreyBlack
Heat Deflection With Post Cure400 °F250 °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™ AIR HTSmooth-Cast™ ONYX™ FAST
Product Type
  • Epoxy Putties
  • Urethane Resins
Mixed ViscosityDough100 cps
Mix Ratio By Volume2A:1B100A:100B
Mix Ratio By Weight2A:1B120A:100B
Pot Life150 minutes2.5 minutes
Cure Time16 hours15 minutes
Shore D Hardness5580
Specific Gravity0.51 g/cc1.09 g/cc
Specific Volume54.31 cu. in./lb.27.7 cu. in./lb.
ColorGreyBlack
Tensile Strength5,840 psi
Tensile Modulus246,000 psi
Elongation @ Break4 %
Compressive Strength8,760 psi
Compressive Modulus77,400 psi
Flexural Strength8,280 psi
Flexural Modulus246,000 psi
Shrinkage0.010 in. / in.
Heat Deflection Temp300 °F
Heat Deflection With Post Cure400 °F250 °F

Product Description

Free Form™ AIR HT

Free Form™ AIR HT is a low density, lightweight epoxy putty that offers high temperature resistance to 300°F/149°C when cured at room temperature and 400°F/204°C when heat post cured. This is a low-odor, low shrinkage formula that is easy to use. Free Form™ AIR HT is mixed by hand with a 2A: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 with modeling board-like properties. It can be sanded, shaped, drilled, tapped and CNC machined/routered.

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Smooth-Cast™ ONYX™ FAST

Smooth-Cast™ ONYX™ is a mercury-free urethane resin that cures at room temperature to a deep black, solid plastic. ONYX™ resins offer the convenience of a 1A:1B by volume mix ratio and have very low viscosities, so they are easy to mix and pour. ONYX™ resins have an ultimate Shore hardness of 80D and offer higher physical properties and higher heat resistance vs. other general purpose resins.ONYX™ FAST resin has a pot life of 2.5 minutes and a cure time of 10-15 minutes. ONYX™ FAST is a good choice for creating fast cold cast bronze, brass, copper, nickel/silver, etc. effects.

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