C
mpare
T
l
Key Differences
| Product Type |
|
|
| Mixed Viscosity | 3,000 cps | 30,000 cps |
| Cure Time | 48 hours | 6 hours |
| Shore A Hardness | 90 | 45 |
| Color | Clear Amber | Purple |
| Tensile Strength | 2,000 psi | 700 psi |
| Elongation @ Break | 550 % | 320 % |
| 100% Modulus | 640 psi | 260 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™-790 | Smooth‑Sil™ 945 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 3,000 cps | 30,000 cps |
| Mix Ratio By Volume | 2A:1B | 1A:1B |
| Mix Ratio By Weight | 2A:1B | 1A:1B |
| Pot Life | 20 minutes | 25 minutes |
| Cure Time | 48 hours | 6 hours |
| Shore A Hardness | 90 | 45 |
| Specific Gravity | 1.07 g/cc | 1.24 g/cc |
| Specific Volume | 25.9 cu. in./lb. | 22.3 cu. in./lb. |
| Color | Clear Amber | Purple |
| Die B Tear Strength | — | 120 pli |
| Die C Tear Strength | 300 pli | — |
| Tensile Strength | 2,000 psi | 700 psi |
| Elongation @ Break | 550 % | 320 % |
| 100% Modulus | 640 psi | 260 psi |
| Shrinkage | <.001 in. / in. | <.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
PMC™-790
PMC™-790 is a Shore 90A industrial urethane rubber compound designed to meet the most stringent requirements of industrial production applications. It is a very hard rubber that offers superior tear and tensile strength as well as impact and abrasion resistance.
Smooth‑Sil™ 945
Smooth-On Smooth-Sil™ Platinum Silicones cure at room temperature with negligible shrinkage. With different hardnesses to choose from, Smooth-Sil™ products offer tremendous versatility and are suitable for making production molds of any configuration, large or small. These silicones exhibit good chemical, abrasion and heat resistance. Materials such as plasters, concrete, wax, low-melt metal alloys or resins (urethane, epoxy or polyester) can then be cast into these silicone rubbers without a release agent.
Smooth-Sil™ Platinum Silicones are used for rapid prototyping, wax casting (foundries and candle makers), architectural restoration and for casting concrete.