Only you would ask that question Sparky.
Good on ya mate! Let me show my age, it used to be varnish, coils were finished in varnished cambric, the cambric being a linen cloth. I still mix my own when I wantsta builds one but when I tear up the sheets BOY does the missus get mad
They are made a LOT more resistant to heat by I'm sure some fancy polymer. Maybe some manufacturer is peering in, but may be unwilling to give up the company secret.
I guess my answer is: It used to be varnish, varnish works fine, a little hard to work with but they do use better stuff now.
BTW, Table 8 shows DC resistance, nice place to start but doesn't have a big basis in reality for AC calcs. You weren't wrong in your answer, but you were .05 ohms off.....shame on you.
[This message has been edited by George Corron (edited 05-01-2002).]