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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 430 cps | Dough |
| Shore D Hardness | 61 | 50 |
| Specific Volume | 26.4 cu. in./lb. | 61.6 cu. in./lb. |
| Color | Translucent White | Grey |
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
| Smooth-Cast™ 61D | Free Form™ AIR | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 430 cps | Dough |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 100A:93B | 1A:1B |
| Pot Life | 7 minutes | — |
| Cure Time | 60 minutes | — |
| Shore D Hardness | 61 | 50 |
| Specific Gravity | 1.05 g/cc | 0.45 g/cc |
| Specific Volume | 26.4 cu. in./lb. | 61.6 cu. in./lb. |
| Color | Translucent White | Grey |
| Tensile Strength | 2,420 psi | — |
| Elongation @ Break | 100 % | — |
| Shrinkage | 0.012 in. / in. | — |
| Heat Deflection Temp | — | 140 °F |
| Buoyant Force | — | 10.4 lb/ft³ |
Product Description
Smooth-Cast™ 61D
The Smooth-Cast™ Semi-Rigid line of low-cost semi-rigid urethane casting resins cure quickly to semi-rigid plastics that offer exceptional strength and impact resistance.
New Formulations – New Look!
Smooth-Cast™ 61D is newly reformulated with a translucent white appearance and improved physical properties. All Smooth-Cast semi rigids are now mercury free and phthalate free. These plastics are easy-to-use (mix ratio is 1A:1B by volume) and have low viscosities for minimal bubble entrapment. Vibrant colors are possible by adding SO-Strong™, UVO™ or Ignite™ colorants.
These semi-rigid plastics are good for making impact resistant prototypes, models, toys, props, climbing holds, etc.
› Click here for more Smooth-Cast™ resin products.
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.