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Key Differences
| Mixed Viscosity | 1,800 cps | 3,000 cps |
| Pot Life | 30 minutes | 40 minutes |
| Cure Time | 16 hours | 24 hours |
| Shore A Hardness | 30 | 60 |
| Color | Clear Amber | Off White |
| Die C Tear Strength | 75 pli | 146 pli |
| Tensile Strength | 400 psi | 1,025 psi |
| 100% Modulus | 82 psi | 230 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 | Formlastic™ 60 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 3,000 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 100A:118B |
| Pot Life | 30 minutes | 40 minutes |
| Cure Time | 16 hours | 24 hours |
| Shore A Hardness | 30 | 60 |
| Specific Gravity | 1.04 g/cc | 1.14 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 24.3 cu. in./lb. |
| Color | Clear Amber | Off White |
| Die C Tear Strength | 75 pli | 146 pli |
| Tensile Strength | 400 psi | 1,025 psi |
| Elongation @ Break | 1,000 % | 1,000 % |
| 100% Modulus | 82 psi | 230 psi |
| Shrinkage | < .001 in. / in. | <0.001 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.
Formlastic™ 60
Formlastic™ 60 urethane is a durable mold rubber made for production casting of concrete. It features a low viscosity for easy mixing and pouring and cures with minimal bubble entrapment. Mix ratio is 1A:1B by volume, pot life is 40 minutes and the rubber cures with an ultimate Shore hardness of Shore 60A. Cured rubber is dimensionally stable (low shrinkage), offers good wear resistance and will render color accurate concrete castings.
IMPORTANT: This product does not contain mercury or quartz silica (non-carcinogenic).