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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 10,000 cps | 80 cps |
| Pot Life | 90 seconds | 9 minutes |
| Cure Time | 1 hour | 30 minutes |
| Shore D Hardness | — | 70 |
| Specific Volume | 69 cu. in./lb. | 26.4 cu. in./lb. |
| Color | White | Off 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
| Soma Foama™ 25 | Smooth-Cast™ 321 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 10,000 cps | 80 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 100A:90B |
| Pot Life | 90 seconds | 9 minutes |
| Handling Time | 20 minutes | — |
| Cure Time | 1 hour | 30 minutes |
| Shore D Hardness | — | 70 |
| Expansion (approximate) | 2-3 times | — |
| Foam Density | 25 lb/ft³ | — |
| Specific Gravity | 0.40 g/cc | 1.05 g/cc |
| Specific Volume | 69 cu. in./lb. | 26.4 cu. in./lb. |
| Color | White | Off White |
| Tensile Strength | — | 3,000 psi |
| Tensile Modulus | — | 138,000 psi |
| Elongation @ Break | — | 8 % |
| Compressive Strength | — | 3,550 psi |
| Compressive Modulus | — | 40,300 psi |
| Flexural Strength | — | 3,500 psi |
| Flexural Modulus | — | 110,000 psi |
| Shrinkage | — | 0.007 in. / in. |
| Heat Deflection Temp | — | 140 °F |
Product Description
Soma Foama™ 25
Soma Foama™ is a soft, two-component platinum silicone flexible foam that is versatile and easy to use. Soma Foama™ 25 is a higher density foam vs. original Soma Foama™ 15 which expands 2-3 times its original volume and develops a uniform 25 lb./cu. ft. cell structure (400 kg/m³). Vibrant colors can be achieved by adding Silc-Pig™ silicone color pigments. Cured foam is high heat resistance (will resist up to 350°F/176°C), water resistant, UV resistant and resists oxidation and ozone degradation.
Smooth-Cast™ 321
The Smooth-Cast™ 320 Series consists of ultra-low viscosity casting resins that yield virtually bubble-free off-white castings. The Smooth-Cast™ 320 resins are sister products to our popular Smooth-Cast™ 300 Series of bright white plastics, but are easier to color using SO-Strong™ or Ignite™ color tints. Smooth-Cast™ 320 series is easy to mix and pour, offering the convenience of a 1A:1B by volume or 100A : 90B by weight mix ratio.
The Smooth-Cast™ 320 Series resins readily accept pigments and fillers (such as URE-FIL™ 3, 5 and 7 from Smooth-On). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast™ 320 Series resins include reproducing small to medium size sculptures, making prototype models, special effect props, decorative jewelry and taxidermy (bones, antlers, teeth etc.).