I think it may be a variation of Gaffer’ tape.
(Think Gaffer(electrician) who works in stage productions…they need to hide things with black tape)

There is a lot of gaffer’s tape, but most of it seems to be black coated masking tape, so the tape side is white. The gaffer’s tape used on our cars in various spots was black on the backside.
The tape for the air cleaners was possibly more of a high heat version?