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Key Differences
| Mixed Viscosity | 1,800 cps | Brushable |
| Pot Life | 30 minutes | 20 minutes |
| Shore A Hardness | 30 | 40 |
| Color | Clear Amber | Off White |
| Tensile Strength | 400 psi | 300 psi |
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 | Brush-On™ 40 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | Brushable |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 100A:125B |
| Pot Life | 30 minutes | 20 minutes |
| Cure Time | 16 hours | 16 hours |
| Shore A Hardness | 30 | 40 |
| Specific Gravity | 1.04 g/cc | 1.17 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 23.7 cu. in./lb. |
| Color | Clear Amber | Off White |
| Die C Tear Strength | 75 pli | 60 pli |
| Tensile Strength | 400 psi | 300 psi |
| Elongation @ Break | 1,000 % | 1,000 % |
| 100% Modulus | 82 psi | — |
| Shrinkage | < .001 in. / in. | <.001 in. / in. |
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.
Brush-On™ 40
Smooth-On’s Brush-On™ Series of mold rubbers are extremely versatile and are famous for their abrasion resistance and high tear strength. They have the convenience of a one-to-one mix ratio and are easy to mix and apply with a brush or spatula.