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Key Differences
| Cure Time | 48 hours | 16 hours |
| Shore A Hardness | 80 | 30 |
| Color | Light Amber | Clear Amber |
| Die C Tear Strength | 200 pli | 75 pli |
| Tensile Strength | 900 psi | 400 psi |
| 100% Modulus | 400 psi | 82 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™-780 WET | PMC™-121 30/WET | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 2,000 cps | 1,800 cps |
| Mix Ratio By Volume | 2A:1B | 1A:1B |
| Mix Ratio By Weight | 2A:1B | 1A:1B |
| Pot Life | 25 minutes | 30 minutes |
| Cure Time | 48 hours | 16 hours |
| Shore A Hardness | 80 | 30 |
| Specific Gravity | 1.02 g/cc | 1.04 g/cc |
| Specific Volume | 27.2 cu. in./lb. | 26.7 cu. in./lb. |
| Color | Light Amber | Clear Amber |
| Die C Tear Strength | 200 pli | 75 pli |
| Tensile Strength | 900 psi | 400 psi |
| Elongation @ Break | 750 % | 1,000 % |
| 100% Modulus | 400 psi | 82 psi |
| Shrinkage | <.001 in. / in. | < .001 in. / in. |
Product Description
PMC™-780 WET
PMC™-780 is a premium performance urethane rubber that offers exceptional strength, durability and abrasion resistance. PMC™-780 DOES NOT CONTAIN MOCA – a known cancer causing agent and hazard. Mixed two parts A to one part B by weight or volume, PMC™-780 urethane pours easily and cures at room temperature with negligible shrinkage to a solid Shore 80A rubber.
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.