Mechanical Properties
Macor machinable glass ceramic is strong and rigid. It has zero porosity and can be polished to a smoothness of 0.5µin.
| Property | Units | Macor |
|---|---|---|
| Density | g/cm3 | 2.52 |
| Young’s Modulus | GPa | 66.9 |
| Poisson’s Ratio | – | 0.29 |
| Compressive Strength | MPa | 345 |
| Flexural Strength @ 25°C | MPa | 94 |
| Fracture Toughness KIc | MPa m1/2 | 1.53 |
| Shear Modulus | GPa | 25.5 |
| Hardness | GPa | 2.3 |
Thermal Properties
Macor will not creep or deform like high temperature plastics. It has low thermal conductivity, which makes it useful as a high temperature insulator. Macor has excellent dimensional stability in a variety of environments (heat, radiation, etc.). It’s coefficient of thermal expansion readily matches most metals and sealing glasses.
| Property | Units | Macor |
|---|---|---|
| Maximum Temperature (Oxidizing) | °C | 800 |
| Maximum Temperature (Inert) | °C | 1000 |
| Thermal Conductivity @ 25°C | W/mK | 1.46 |
| Specific Heat | kJ/kg°C | 0.79 |
| CTE1 25°C ➞ -100°C | 10-6/K | 8.1 |
| CTE1 25°C ➞ 300°C | 10-6/K | 9 |
| CTE1 25°C ➞ 600°C | 10-6/K | 11.2 |
| CTE1 25°C ➞ 800°C | 10-6/K | 12.3 |
Electrical Properties
Macor machinable glass ceramic is a good electric insulator, especially at high temperatures. It works excellent with high voltages and a broad spectrum of frequencies. It is also radiation resistant.
| Property | Units | Macor |
|---|---|---|
| Resistivity @ 25°C | ohm-cm | 1014 |
| Dielectric Constant @ 1KHz | – | 6.01 |
| Dielectric Constant @ 8.5 GHz | – | 5.64 |
| Loss Tangent | 1 kHz | 0.0040 |
| Loss Tangent | 8.5 GHz | 0.0025 |
Dielectric Strength (AC) average | kV/mm | 45 |
Dielectric Strength (DC) average | kV/mm | 129 |
| Volume Resistivity @25°C | ohm-cm | >1017 |
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