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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 12,500 cps |
| Pot Life | 30 minutes | 45 minutes |
| Cure Time | 16 hours | 6 hours |
| Color | Clear Amber | Blue |
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™-121 30/WET | Mold Star™ 30 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 12,500 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 100A:96B |
| Pot Life | 30 minutes | 45 minutes |
| Cure Time | 16 hours | 6 hours |
| Shore A Hardness | 30 | 30 |
| Specific Gravity | 1.04 g/cc | 1.12 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 24.7 cu. in./lb. |
| Color | Clear Amber | Blue |
| Die B Tear Strength | — | 88 pli |
| Die C Tear Strength | 75 pli | — |
| Tensile Strength | 400 psi | 420 psi |
| Elongation @ Break | 1,000 % | 339 % |
| 100% Modulus | 82 psi | 96 psi |
| Shrinkage | < .001 in. / in. | <.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
PMC™-121 30/WET
The PMC™-121 Series urethane rubbers feature convenient one-to-one by volume mix ratios. PMC™-121/30 Wet is exceptionally strong and abrasion resistant for soft urethane mold rubbers. It exudes oil that aids in demolding hard plasters and concrete.
Mold Star™ 30
Mold Star™ mold rubbers are easy to use platinum silicones which are mixed 1A:1B by volume (no weighing scale necessary). Mold Star™ silicones feature relatively low viscosities and vacuum degassing is not required for most applications. Mold Star™ 30 is a harder material, with a 30A Shore hardness.