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Key Differences
| Product Type |
|
|
| Mixed Viscosity | Brushable | 35,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 18 minutes | 30 minutes |
| Cure Time | 16 hours | 24 hours |
| Color | Grey | Pink |
| Tensile Strength | 420 psi | 600 psi |
| Elongation @ Break | 577 % | 300 % |
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
| EZ-Mix™ 40 | Smooth‑Sil™ 940 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | Brushable | 35,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 100A:95B | 100A:10B |
| Pot Life | 18 minutes | 30 minutes |
| Thin Film Recoat Time | 60 minutes | — |
| Cure Time | 16 hours | 24 hours |
| Shore A Hardness | 40 | 40 |
| Specific Gravity | 1.025 g/cc | 1.18 g/cc |
| Specific Volume | 27 cu. in./lb. | 23.4 cu. in./lb. |
| Color | Grey | Pink |
| Die B Tear Strength | — | 100 pli |
| Die C Tear Strength | 67 pli | — |
| Tensile Strength | 420 psi | 600 psi |
| Elongation @ Break | 577 % | 300 % |
| 100% Modulus | — | 200 psi |
| Shrinkage | <.001 in. / in. | <.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
EZ-Mix™ 40
EZ~MIX™ 40 is a brushable polyurethane rubber mold compound that mixes and applies easily. Two liquids (Part A and Part B) are measured and combined in equal amounts by volume (no scale is necessary). After a few minutes of mixing, EZ~MIX™ 40 is ready to be applied to a vertical surface with a brush. After a suitable thickness is attained (multiple layers), EZ~MIX™ 40 cures overnight with negligible shrinkage to a flexible, durable mold rubber. Following the application of a support shell, a rubber mold made with EZ~MIX™ 40 is suitable for casting a variety of materials including wax, gypsum, urethane/epoxy resins, concrete, cement, etc.
Smooth‑Sil™ 940
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. Smooth-Sil™ 940 is suitable for food related applications.