C
mpare
T
l
Key Differences
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 600 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 30 minutes | 9 minutes |
| Cure Time | 16 hours | 90 minutes |
| Shore D Hardness | — | 80 |
| Shore A Hardness | 30 | — |
| Color | Clear Amber | Clear |
| Tensile Strength | 400 psi | 3,500 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 | Crystal Clear™ 202 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 600 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 1A:1B | 100A:90B |
| Pot Life | 30 minutes | 9 minutes |
| Cure Time | 16 hours | 90 minutes |
| Shore D Hardness | — | 80 |
| Shore A Hardness | 30 | — |
| Specific Gravity | 1.04 g/cc | 1.036 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 26.7 cu. in./lb. |
| Color | Clear Amber | Clear |
| Die C Tear Strength | 75 pli | — |
| Tensile Strength | 400 psi | 3,500 psi |
| Tensile Modulus | — | 86,240 psi |
| Elongation @ Break | 1,000 % | 10 % |
| 100% Modulus | 82 psi | — |
| Compressive Strength | — | 4,200 psi |
| Compressive Modulus | — | 44,000 psi |
| Flexural Strength | — | 5,390 psi |
| Flexural Modulus | — | 183,200 psi |
| Shrinkage | < .001 in. / in. | 0.0125 in. / in. |
| Heat Deflection Temp | — | 120 °F |
| Index of Refraction at 20°C | — | 1.49888 |
| Index of Refraction at 25°C | — | 1.49893 |
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.
Crystal Clear™ 202
Crystal Clear™ 202 is a water white clear and made specifically for applications that require clarity. These rigid urethane casting resins differ only in working and demold times. Low viscosity ensures easy mixing and pouring. Crystal Clear™ resins cure at room temperature* with negligible shrinkage.
CAUTION: NOT FOR HOME USE. THIS PRODUCT IS FOR INDUSTRIAL USE ONLY. With adequate local exhaust ventilation, respiratory protection is not normally required when using this product. Where risk assessment shows air-purifying respirators are appropriate, follow OSHA respirator regulations and European Standards EN 141, 143 and 371. Protective clothing (gloves and long sleeves) is required to minimize the risk of dermal sensitization. If breathing is affected or a dermal rash develops, immediately cease using this product and seek medical attention. Read SDS before using.