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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 5,000 cps | 35,000 cps |
| Pot Life | 3 hours | 30 minutes |
| Barcol 935 Hardness | 93 | — |
| Shore A Hardness | — | 40 |
| Specific Volume | 18.22 cu. in./lb. | 23.4 cu. in./lb. |
| Color | Black | Pink |
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
| EpoxAcast™ 650 BLACK + HT Hardener | Smooth‑Sil™ 940 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 5,000 cps | 35,000 cps |
| Mix Ratio By Weight | 100A:10B | 100A:10B |
| Pot Life | 3 hours | 30 minutes |
| Cure Time | Twenty Four Hours Followed By Post Cures | 24 hours |
| Barcol 935 Hardness | 93 | — |
| Shore A Hardness | — | 40 |
| Specific Gravity | 1.52 g/cc | 1.18 g/cc |
| Specific Volume | 18.22 cu. in./lb. | 23.4 cu. in./lb. |
| Color | Black | Pink |
| Die B Tear Strength | — | 100 pli |
| Tensile Strength | — | 600 psi |
| Tensile Modulus | 1,079,000 psi | — |
| Ultimate Tensile | 6,900 psi | — |
| Tensile Elongation | 0.82 % | — |
| Elongation @ Break | — | 300 % |
| 100% Modulus | — | 200 psi |
| Compressive Strength | 15,980 psi | — |
| Compressive Modulus | 134,000 psi | — |
| Flexural Strength | 10,850 psi | — |
| Flexural Modulus | 775,000 psi | — |
| Shrinkage | 0.007 in. / in. | <.001 in. / in. |
| Heat Deflection Temp | 187 °F | — |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
EpoxAcast™ 650 BLACK + HT Hardener
EpoxAcast™ 650 Black is a mineral filled general purpose casting epoxy that is low cost and versatile. It features a low mixed viscosity for minimal bubble entrapment.EpoxAcast™ 650 Black is used for making hard dies for metal stamping as well as patterns and fixtures. It is also used for electrical encapsulation to extend the life cycles and enhance the performance of potted electronic devices. The high compressive strength of EpoxAcast™ 650 Black makes it ideal for making stamping dies for production pressing of metal ornaments.
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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.