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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 2,000 cps | 11,000 cps |
| Pot Life | 25 minutes | 6 minutes |
| Cure Time | 48 hours | 30 minutes |
| Shore A Hardness | 80 | 20 |
| Color | Light Amber | Translucent |
| Tensile Strength | 900 psi | 420 psi |
| Elongation @ Break | 750 % | 470 % |
| 100% Modulus | 400 psi | 47 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 | Mold Star™ 20T | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 2,000 cps | 11,000 cps |
| Mix Ratio By Volume | 2A:1B | 1A:1B |
| Mix Ratio By Weight | 2A:1B | 1A:1B |
| Pot Life | 25 minutes | 6 minutes |
| Cure Time | 48 hours | 30 minutes |
| Shore A Hardness | 80 | 20 |
| Specific Gravity | 1.02 g/cc | 1.08 g/cc |
| Specific Volume | 27.2 cu. in./lb. | 25.6 cu. in./lb. |
| Color | Light Amber | Translucent |
| Die B Tear Strength | — | 90 pli |
| Die C Tear Strength | 200 pli | — |
| Tensile Strength | 900 psi | 420 psi |
| Elongation @ Break | 750 % | 470 % |
| 100% Modulus | 400 psi | 47 psi |
| Shrinkage | <.001 in. / in. | <.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
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.
Mold Star™ 20T
Mold Star™ 20T is an easy to use Shore 20A translucent platinum silicone that is mixed 1A:1B by volume (no weighing scale necessary). It features a relatively low viscosity and vacuum degassing is not required for most applications. Pot life is 6 minutes and cure time is 30 minutes at room temperature.