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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 3,000 cps | 80 cps |
| Cure Time | 48 hours | 4 hours |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 90 | — |
| Color | Clear Amber | Off White |
| Tensile Strength | 2,000 psi | 3,000 psi |
| Elongation @ Break | 550 % | 8 % |
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
| PMC™-790 | Smooth-Cast™ 322 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 3,000 cps | 80 cps |
| Mix Ratio By Volume | 2A:1B | 1A:1B |
| Mix Ratio By Weight | 2A:1B | 100A:90B |
| Pot Life | 20 minutes | 20 minutes |
| Cure Time | 48 hours | 4 hours |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 90 | — |
| Specific Gravity | 1.07 g/cc | 1.05 g/cc |
| Specific Volume | 25.9 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Clear Amber | Off White |
| Die C Tear Strength | 300 pli | — |
| Tensile Strength | 2,000 psi | 3,000 psi |
| Tensile Modulus | — | 134,000 psi |
| Elongation @ Break | 550 % | 8 % |
| 100% Modulus | 640 psi | — |
| Compressive Strength | — | 3,550 psi |
| Compressive Modulus | — | 40,300 psi |
| Flexural Strength | — | 3,500 psi |
| Flexural Modulus | — | 110,000 psi |
| Shrinkage | <.001 in. / in. | 0.007 in. / in. |
| Heat Deflection Temp | — | 140 °F |
Product Description
PMC™-790
PMC™-790 is a Shore 90A industrial urethane rubber compound designed to meet the most stringent requirements of industrial production applications. It is a very hard rubber that offers superior tear and tensile strength as well as impact and abrasion resistance.
Smooth-Cast™ 322
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.).