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Key Differences
| Mixed Viscosity | Brushable | 21,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 20 minutes | 60 minutes |
| Cure Time | 6 hours | 24 hours |
| Shore A Hardness | 25 | 36 |
| Color | Orange | Blue |
| Elongation @ Break | 690 % | 500 % |
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
| Rebound™ 25 | Smooth‑Sil™ 936 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | Brushable | 21,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 1A:1B | 100A:10B |
| Pot Life | 20 minutes | 60 minutes |
| Cure Time | 6 hours | 24 hours |
| Shore A Hardness | 25 | 36 |
| Specific Gravity | 1.14 g/cc | 1.21 g/cc |
| Specific Volume | 23.5 cu. in./lb. | 22.9 cu. in./lb. |
| Color | Orange | Blue |
| Die B Tear Strength | 102 pli | 110 pli |
| Tensile Strength | 515 psi | 550 psi |
| Elongation @ Break | 690 % | 500 % |
| 100% Modulus | — | 180 psi |
| Shrinkage | <.001 in. / in. | <0.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
Rebound™ 25
Rebound™ 25 is an easy-to-use platinum-cure silicone rubber which self-thickens for making brush-on molds of almost any model. Mixed 1A:1B by volume (no scale necessary), Rebound™ rubber can be applied with a brush or spatula to vertical surfaces without sagging and will cure with negligible shrinkage to a flexible rubber.
Smooth‑Sil™ 936
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™ 936 is a lower viscosity platinum silicone rubber (21,000 cps). It is easier to mix, vacuum degas and pour. Smooth-Sil™ Platinum Silicones are used for rapid prototyping, wax casting (foundries and candle makers), architectural restoration and for casting concrete.