Re: What to use for potting transformers.
Thermal insulation and resistance go together with most materials, so getting a thermally conducting but electrically insulating material is not very easy. Think of the (highly toxic) Berylium oxide used on some 'scope output transistors.
A few vent holes makes best sense, if necessary backed up by a small fan.
Alternatively, loadsa cash for something a bit exotic.
Les.
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