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Old 11th Feb 2019, 12:02 pm   #4
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
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Default Re: PTFE tape for transformer insulation

Originally Posted by TowerRadio View Post
Is plumbers PTFE tape any good for insulation between transformer windings? I am not talking about EHT,mainly low voltage AC and heater windings.Les
I have seen it used, but it is very soft and pressure thins it significantly.

I have found that the better tape for transformers, between layers or groups of windings is Polyamide, otherwise known as Kapton tape. An example here:

It is temperature resistant and strong.

For the outer bobbin layer I have come to use Scotch 27 tape as it is also temperature and burn resistant. Both of these tapes are superior to the common yellow transformer tape. Here is an example:
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