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Key Differences
| Product Type |
|
|
| Mixed Viscosity | Dough | 100 cps |
| Pot Life | 150 minutes | 2.5 minutes |
| Cure Time | 16 hours | 15 minutes |
| Shore D Hardness | 55 | 80 |
| Specific Volume | 54.31 cu. in./lb. | 27.7 cu. in./lb. |
| Color | Grey | Black |
| Heat Deflection With Post Cure | 400 °F | 250 °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 HT | Smooth-Cast™ ONYX™ FAST | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | Dough | 100 cps |
| Mix Ratio By Volume | 2A:1B | 100A:100B |
| Mix Ratio By Weight | 2A:1B | 120A:100B |
| Pot Life | 150 minutes | 2.5 minutes |
| Cure Time | 16 hours | 15 minutes |
| Shore D Hardness | 55 | 80 |
| Specific Gravity | 0.51 g/cc | 1.09 g/cc |
| Specific Volume | 54.31 cu. in./lb. | 27.7 cu. in./lb. |
| Color | Grey | Black |
| Tensile Strength | — | 5,840 psi |
| Tensile Modulus | — | 246,000 psi |
| Elongation @ Break | — | 4 % |
| Compressive Strength | — | 8,760 psi |
| Compressive Modulus | — | 77,400 psi |
| Flexural Strength | — | 8,280 psi |
| Flexural Modulus | — | 246,000 psi |
| Shrinkage | — | 0.010 in. / in. |
| Heat Deflection Temp | 300 °F | — |
| Heat Deflection With Post Cure | 400 °F | 250 °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.
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.