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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 300 cps |
| Pot Life | 30 minutes | 3 minutes |
| Cure Time | 16 hours | 30 minutes |
| Shore D Hardness | — | 57 |
| Shore A Hardness | 30 | — |
| Color | Clear Amber | Translucent White |
| Tensile Strength | 400 psi | 2,420 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 | Smooth-Cast™ 57D | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 300 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 100A:93B |
| Pot Life | 30 minutes | 3 minutes |
| Cure Time | 16 hours | 30 minutes |
| Shore D Hardness | — | 57 |
| Shore A Hardness | 30 | — |
| Specific Gravity | 1.04 g/cc | 1.05 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Clear Amber | Translucent White |
| Die C Tear Strength | 75 pli | — |
| Tensile Strength | 400 psi | 2,420 psi |
| Elongation @ Break | 1,000 % | 100 % |
| 100% Modulus | 82 psi | — |
| Shrinkage | < .001 in. / in. | 0.012 in. / in. |
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.
Smooth-Cast™ 57D
Smooth-Cast™ 57D is a semi-rigid urethane plastic that offers a gradual cure profile (does not snap cure), making it suitable for machine or hand rotational casting.
Use For Rotational Casting - Once poured into a suitable rubber mold configuration, the mold can be rotated so that the resin mixture gradually coats the inside of the mold cavity. After an adequate wall thickness is attained inside the mold, the result is a cured hollow casting that is semi-rigid and highly impact resistant.
Use as a Casting Resin – Smooth-Cast™ 57D can also be used as a casting resin for making solid, semi-rigid castings that are tough and durable.
Mix ratio is 1A:1B by volume. Working time is 3 minutes, demold time is 30 minutes and full cure properties are attained after 24 hours. Color is white translucent and the material is very easy to color with SO-Strong™, UVO™ or Ignite™ colorants. Cured resin is also easy to paint with acrylic paints or UreCoat™ flexible coating for applications requiring thick, durable finishes.