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Key Differences
| Product Type |
|
|
| Mixed Viscosity | Dough | 800 cps |
| Shore D Hardness | 50 | — |
| Shore A Hardness | — | 40 |
| Specific Volume | 61.6 cu. in./lb. | 25.9 cu. in./lb. |
| Color | Grey | Translucent White |
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 | KX Flex™ 40 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | Dough | 800 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 1A:1B |
| Pot Life | — | 2.5 minutes |
| Handling Time | — | 30 minutes |
| Cure Time | — | 24 hours |
| Shore D Hardness | 50 | — |
| Shore A Hardness | — | 40 |
| Specific Gravity | 0.45 g/cc | 1.07 g/cc |
| Specific Volume | 61.6 cu. in./lb. | 25.9 cu. in./lb. |
| Color | Grey | Translucent White |
| Tensile Strength | — | 457 psi |
| Elongation @ Break | — | 400 % |
| Shrinkage | — | 0.002 in. / in. |
| Heat Deflection Temp | 140 °F | — |
| Buoyant Force | 10.4 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.
KX Flex™ 40
KX Flex™ Series urethanes are fast setting flexible urethane casting elastomers that cure quickly and offer exceptional physical and performance properties including high impact resistance. KX Flex™ Series urethanes are easy to color using SO-Strong™, UVO™ or IGNITE™ colorants. KX Flex™ urethanes are phthalate free, mercury free and MOCA free.
KX Flex™ Series urethanes have a pot life of 2.5 minutes and handling time of 30 minutes (depending on mass). With Shore hardness values of 40A, 60A and 90A, this material is used for a variety of applications including fast mold making, fast model duplication, prototyping, durable miniatures, props and special effects, or making parts that are impact resistant. Fully cured castings are flexible, tough and durable.
Cured KX Flex™ 40 will have a slight tack which will subside over time depending on mass and ambient temperature.