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Materials
MTC Wesgo specialises in various products made from a range of different grades of Alumina. The main properties of these materials can be seen in the table below:
Please note that all values quoted are based on test pieces and may vary according to component design. These values are not guaranteed in any way and should only be treated as indicative values. They should be used for guidance only and for no other purpose whatsoever.
| Property | Unit | Temp. | AL500® | AL300® | AL995® |
|---|---|---|---|---|---|
| AL203Content | % | - | 94.0 | 97.6 | 99.5 |
| Flexural Strength | MPa | R.T. | 345 | 296 | 310 |
| Compressive Strength | MPa | R.T. | >2070 | >1720 | >2070 |
| Density | g/cm3 | R.T. | 3.67 | 3.76 | 3.86 |
| Porosity | % water absorption | - | Vacuum Tight 0.00 | Vacuum Tight 0.00 | Vacuum tight 0.00 |
| Colour | - | - | White | White | White/Ivory |
| Hardness | HR 45N | - | 78 | 75 | 81 |
| Thermal Conductivity | W/m K | R.T. | 20.5 | 26.8 | 29.3 |
| Coefficient of Linear Thermal Expansion | ppm/K | 25 - 200°C 200 - 400°C 400 - 600°C 600 - 800°C 800 - 1000°C
| 6.3 7.5 8.0 8.6 9.1 | 6.9 7.8 8.5 8.8 | 6.9 7.8 8.3 9.0 9.4 |
| Max. Working Temperature | oC | - | 1600 | 1650 | 1725 |
| Dielectric Strength | D.C. V/mil D.C. kV/mm | R.T. | 650 25.6 | 1100 43.3 | 800 31.5 |
| Te Value | oC | - | >950 | > 1000 | > 975 |
| Volume Resistivity | Ω cm | 25°C
300°C 600°C 900°C | > 1014
2.0 · 1012 4.6 · 1008 3.5 · 1006 | > 1014
1.0 · 1012 2.3 · 1010 5.0 · 1008 | > 1014 2.0 · 1011 6.0 · 1008 2.5 · 1006 |
| Dielectric Constant (K') | - | 25°C
300°C 500°C | 10/1000/8500 MHz
9.07/9.04/8.99 9.53/-/9.26 9.91/-/9.40 | 10/1000/8500 MHz 9.53/9.00/9.04 9.91/-/9.32 10.14/-/9.54 | 10/1000/8500 MHz 9.58/9.30/9.37 9.92/-/9.61 10.20/-/9.82 |
| Dissipation Factor (tan δ) | - | 25°C
300°C 500°C | 10/1000/8500 MHz
0.00026/0.00062/0.00078 0.00028/-/0.00155 0.00341/-/0.00155 | 10/1000/8500 MHz 0.00004/0.00030/0.00045 0.00016/-/0.00040 0.00052/-/0.00072 | 10/1000/8500 MHz
0.00003/0.00014/0.00009 0.00009/-/0.00014 0.00040/-/0.00025 |
