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|---|---|---|---|
| MO | 1800 | 1600 | 1600 |
| Ta | 2300 | - | 2300 |
| W(short term) | 3000 | 3000 | - |
| W(maximum time) | 2450 | 2450 | - |

| W | MO | |
|---|---|---|
| Dry H2 | no reaction | |
| Dry N3 | no reaction | |
| NH3 | 1000¡É dry gas: no reaction | |
| Air | 500¡É | 400¡É |
| Water vapor | Dew points between 10¡É and 20 ¡É : 1370¡É At lower points : no reaction |
|
| CO | 1400¡É | 1400¡É |
| CO2 | 1200¡É | 1240¡É |
| Hydro carbon | 1200¡É | 1100¡É |
| VAC | 2500¡É | 1800¡É |

| in vacuum | ||
|---|---|---|
| W | MO | |
| Aluminum oxide | 1900¡É | 1900¡É |
| Beryllium oxide | 2000¡É | 1900¡É |
| Graphite | 1200¡É | 1100¡É |
| Magnetite oxide | 1600¡É | 1600¡É |
| Silicon carbons | 1300¡É | 1300¡É |
| Zirconium oxide | 1900¡É | 1900¡É |