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Is thermal grease/paste also electrically conductive?

Is thermal grease/paste also electrically conductive? I've seen phone line repairmen squeeze a dollop of this clear grease into a phone jack before they plug a RJ11 in and they tell me that it's an electrically-conductive grease that prevents moisture from interfering with the connection but conducts electricity fine.

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It depends on what is in the grease compound.

Here is a link to one example where it is both electrically and thermally conductive.,

Whereas this one is non electrically conductive but has high thermal conductivity.

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Many thanks for your answer. It answered my question completely.


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