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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 12,000 cps | 35,000 cps |
| Pot Life | 4 hours | 45 minutes |
| Shore D Hardness | 90 | — |
| Shore A Hardness | — | 50 |
| Specific Volume | 16.5 cu. in./lb. | 22.3 cu. in./lb. |
| Color | Grey | Blue |
| Thermal Conductivity | 0.675 W/M*K | 0.261 W/M*K |
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™ 655 + HT Hardener | Smooth‑Sil™ 950 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 12,000 cps | 35,000 cps |
| Mix Ratio By Weight | 100A:8B | 100A:10B |
| Pot Life | 4 hours | 45 minutes |
| Cure Time | Twenty Four Hours Followed By Post Cures | 18 hours |
| Shore D Hardness | 90 | — |
| Shore A Hardness | — | 50 |
| Specific Gravity | 1.64 g/cc | 1.24 g/cc |
| Specific Volume | 16.5 cu. in./lb. | 22.3 cu. in./lb. |
| Color | Grey | Blue |
| Die B Tear Strength | — | 155 pli |
| Tensile Strength | — | 725 psi |
| Tensile Modulus | 7,200,000 psi | — |
| Ultimate Tensile | 6,000 psi | — |
| Tensile Elongation | 0.50 % | — |
| Elongation @ Break | — | 320 % |
| 100% Modulus | — | 272 psi |
| Compressive Strength | 15,700 psi | — |
| Compressive Modulus | 270,000 psi | — |
| Shrinkage | 0.001 in. / in. | <.001 in. / in. |
| Heat Deflection Temp | 225 °F | — |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
| Thermal Conductivity | 0.675 W/M*K | 0.261 W/M*K |
Product Description
EpoxAcast™ 655 + HT Hardener
EpoxAcast™ 655 (formerly Metalset™ A-30) is a versatile aluminum filled castable epoxy resin that is very hard and strong. It is dimensionally stable, even when mass cast up to 512 in³ / 8,390 cm³. Maximum heat resistance is achieved using HT HIGH TEMP hardener (up to 225°F/108°C).
Smooth‑Sil™ 950
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™ 950 is suitable for food related applications.