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Key Differences
| Shore A Hardness | 30 | 45 |
| Color | Clear Amber | Off White |
| Die C Tear Strength | 75 pli | 100 pli |
| Tensile Strength | 400 psi | 886 psi |
| 100% Modulus | 82 psi | 116 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 | VytaFlex™ 45 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,800 cps | 2,000 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 1A:1B | 1A:1B |
| Pot Life | 30 minutes | 30 minutes |
| Cure Time | 16 hours | 16 hours |
| Shore A Hardness | 30 | 45 |
| Specific Gravity | 1.04 g/cc | 1.04 g/cc |
| Specific Volume | 26.7 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Clear Amber | Off White |
| Die C Tear Strength | 75 pli | 100 pli |
| Tensile Strength | 400 psi | 886 psi |
| Elongation @ Break | 1,000 % | 900 % |
| 100% Modulus | 82 psi | 116 psi |
| Shrinkage | < .001 in. / in. | <.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.
VytaFlex™ 45
Using Smooth-On’s exclusive “V-Polymer™” technology, VytaFlex™ urethane rubbers offer superior physical and performance properties for casting concrete. VytaFlex™ urethanes are available in 10A, 20A, 30A, 40A, 45A, 50A and 60A Shore hardness’s and feature convenient one-to-one by volume mix ratios.
Vacuum degassing is not necessary and VytaFlex™ rubbers cure with negligible shrinkage to a durable rubber that will last in production.
VytaFlex™ mold rubbers work especially well for casting pigmented / colored concrete. Molds made with VytaFlex™ Series urethanes will render accurate and uniform colored castings.
FOR COMMERCIAL/INDUSTRIAL USE ONLY