Interesting, here is a 20-80pF >5kV?variable capacitor someone 3D printer using kapton tape as the dielectric.?
Looks like the designer of this is trying to use it to tune a magnetic loop and having issues with heating above 50 watts; judging from the comments section. So, kapton may be a low Q, high loss, material, too.
Kapton has gained a bad reputation for degrading, as an insulator, over time.?
I'll look around for a table that lists dielectric materials and their losses.
Tom, wb6b
