A pair of high quality alumina ceramic (Al2O3) thermal blocks for high temperature tube furnaces. These refractory blocks must be placed in front of vacuum sealing flanges to minimize heat damage to the silicon sealing gasket.
| Tube size | Thermal block size |
| For 40mm OD tubes | 30mm OD, 80mm length |
| For 60mm OD tubes | 50mm OD, 80mm length |
| For 75mm OD tubes | 67mm OD, 80mm length |
| For 80mm OD tubes | 67mm OD, 80mm length |
| For 100mm OD tubes | 85mm OD, 80mm length |
| For 120mm OD tubes | 105mm OD, 80mm length |
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