this company has 1 mil Glassine, which is the standard layer insulation for most line/mic level audio transformers, all your classic UTC, Peerless and Triad transformers uses this stuff in between layers of light wire.
Some transformers i have seen use 0.0005" , but i have not found any of that paper yet.
1 mil Glassine is good down to #42 wire,
cutting this stuff will require a quality paper cutter or you can use scissors if you are just doing small quantity work.
https://www.dickblick.com/products/glassine-interleaving-paper/
here is an insulation chart from RDH4 which shows what thickness insulation goes with what gauge wire>
Some transformers i have seen use 0.0005" , but i have not found any of that paper yet.
1 mil Glassine is good down to #42 wire,
cutting this stuff will require a quality paper cutter or you can use scissors if you are just doing small quantity work.
https://www.dickblick.com/products/glassine-interleaving-paper/
here is an insulation chart from RDH4 which shows what thickness insulation goes with what gauge wire>