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How to seal electrical feedthroughs?

For sealing of the electrical feedthroughs, we would recommend using polymer solutions, for example, a normal lab binder used for shaping powders. The polymer should be stable up to 75 oC or 165oC for a high-temperature base unit. In our lab we use a mix of  B60 and B72 paraloids dissolved in ethyl acetate. For sealing the base unit should be fixed upside-down, and a few drops of binder should be added in each feedthrough hole. Preferably, the cell should be simultaneously evacuated. An outer transportation quartz tube can be used for locking the cell during sealing. Alternatively, a leaky feedthrough can be sealed from top using a high-temperature vacuum tight glue, like JB Weld.

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