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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 30,000 cps | 1,200 cps |
| Mix Ratio By Volume | N/A (gram scale required) | 2A:1B |
| Pot Life | 45 minutes | 15 minutes |
| Color | Green | Ranges From Amber To Blue |
| Elongation @ Break | 270 % | 650 % |
| 100% Modulus | 280 psi | 220 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
| Smooth‑Sil™ 960 | PMC™-746 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 30,000 cps | 1,200 cps |
| Mix Ratio By Volume | — | 2A:1B |
| Mix Ratio By Weight | 100A:10B | 2A:1B |
| Pot Life | 45 minutes | 15 minutes |
| Cure Time | 16 hours | 16 hours |
| Shore A Hardness | 60 | 60 |
| Specific Gravity | 1.25 g/cc | 1.03 g/cc |
| Specific Volume | 22.2 cu. in./lb. | 26.9 cu. in./lb. |
| Color | Green | Ranges From Amber To Blue |
| Die B Tear Strength | 110 pli | — |
| Die C Tear Strength | — | 100 pli |
| Tensile Strength | 650 psi | 700 psi |
| Elongation @ Break | 270 % | 650 % |
| 100% Modulus | 280 psi | 220 psi |
| Shrinkage | <.001 in. / in. | < .001 in. / in. |
| Useful Temperature (min) | -65 °F | — |
| Useful Temperature (max) | 450 °F | — |
Product Description
Smooth‑Sil™ 960
Smooth-Sil™ 960 is a Shore 60A platinum cure silicone rubber developed for a variety of industrial applications. Compared to other 60A platinum silicones, Smooth-Sil™ 960 has a relatively low viscosity and is easy to mix, de-air and pour. Silicone cures in 16 hours with negligible shrinkage to a firm rubber with high tensile and tear strength.
Smooth-Sil™ 960 offers good chemical and heat resistance, making this a good choice for production casting of resins and expanding foams. Because of its firmness, Smooth-Sil™ 960 molds are also used for spin casting. It is also used for embedding and electrical applications. Smooth-Sil™ 960 is suitable for food related applications.
Note: This product will not cure against surfaces containing sulfur, even when sealed.
PMC™-746
PMC™-746 was developed to make molds for casting gypsum plasters. This product is well suited for use as a rubber case mold – especially large case molds where extra rigidity is required. Shore hardness is 60A. Because of its durability and moisture resistant properties PMC™-746 is also used by zoos and museums for a variety of mold-making, display and exhibit applications. It features a convenient mix ratio (2:1 by weight or volume), and contains no mercury.
Other applications include making plaster block molds, reproducing ornamental plaster (architectural restoration), pre-cast concrete molds, casting waxes, Smooth-On rigid polyurethanes and epoxies and also for making a variety of special effects for movies and theatre.
FOR COMMERCIAL/INDUSTRIAL USE ONLY