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Key Differences
| Mixed Viscosity | 1,800 cps | 3,000 cps |
| Pot Life | 30 minutes | 20 minutes |
| Cure Time | 16 hours | 48 hours |
| Shore A Hardness | 30 | 90 |
| Die C Tear Strength | 75 pli | 300 pli |
| Tensile Strength | 400 psi | 2,000 psi |
| 100% Modulus | 82 psi | 640 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/DRY | PMC™-790 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 3,000 cps |
| Mix Ratio By Volume | 1A:1B | 2A:1B |
| Mix Ratio By Weight | 1A:1B | 2A:1B |
| Pot Life | 30 minutes | 20 minutes |
| Cure Time | 16 hours | 48 hours |
| Shore A Hardness | 30 | 90 |
| Specific Gravity | 1.04 g/cc | 1.07 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 25.9 cu. in./lb. |
| Color | Clear Amber | Clear Amber |
| Die C Tear Strength | 75 pli | 300 pli |
| Tensile Strength | 400 psi | 2,000 psi |
| Elongation @ Break | 1,000 % | 550 % |
| 100% Modulus | 82 psi | 640 psi |
| Shrinkage | < .001 in. / in. | <.001 in. / in. |
Product Description
PMC™-121 30/DRY
The PMC™-121 Series urethane rubbers feature convenient one-to-one by volume mix ratios. PMC™-121/30 Dry is exceptionally strong and abrasion resistant for soft urethane mold rubbers. It does not exude oil and can be used for casting waxes, Smooth-On liquid plastics, gypsum plasters and other materials.
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.