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Key Differences
| Product Type |
|
|
| Mix Ratio By Volume | N/A (gram scale required) | 1A:1B |
| Pot Life | 4 hours | 6 minutes |
| Shore D Hardness | 90 | — |
| Shore A Hardness | — | 20 |
| Specific Volume | 16.5 cu. in./lb. | 25.6 cu. in./lb. |
| Color | Grey | Translucent |
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 | Mold Star™ 20T | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 12,000 cps | 11,000 cps |
| Mix Ratio By Volume | — | 1A:1B |
| Mix Ratio By Weight | 100A:8B | 1A:1B |
| Pot Life | 4 hours | 6 minutes |
| Cure Time | Twenty Four Hours Followed By Post Cures | 30 minutes |
| Shore D Hardness | 90 | — |
| Shore A Hardness | — | 20 |
| Specific Gravity | 1.64 g/cc | 1.08 g/cc |
| Specific Volume | 16.5 cu. in./lb. | 25.6 cu. in./lb. |
| Color | Grey | Translucent |
| Die B Tear Strength | — | 90 pli |
| Tensile Strength | — | 420 psi |
| Tensile Modulus | 7,200,000 psi | — |
| Ultimate Tensile | 6,000 psi | — |
| Tensile Elongation | 0.50 % | — |
| Elongation @ Break | — | 470 % |
| 100% Modulus | — | 47 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 | — |
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).
Mold Star™ 20T
Mold Star™ 20T is an easy to use Shore 20A translucent platinum silicone that is mixed 1A:1B by volume (no weighing scale necessary). It features a relatively low viscosity and vacuum degassing is not required for most applications. Pot life is 6 minutes and cure time is 30 minutes at room temperature.