And the problem is kapton is just one of many polyimides, (pmda-oda) there are other others like P84 (btda-tdi/mdi).

But nobody knows the generic name (the acronym isn't even in the wikipedia article) so fly by night vendors use 'kapton' wherever they can get away with it.

(and as with teflon, iirc they sell other polymers under the name of kapton too)