I agree with Buck, the Kapton leadwire insulation is the
source of any controversy involving Kapton in the aerospace
industry. Kapton (in sheet form) is the material specified by
NASA for insulation of heating elements (See GSFC Spec
S311-P-079) and some sensors that go into mission-critical
applications. It has been this way for almost half a century, and
they still use Kapton. Currently, leadwires used in most
aerospace applications are not Kapton, but PTFE or ETFE
insulated. I would say that concerns using Kapton Heaters and
sensors in aerospace are unfounded.
"A witty saying proves nothing."
-Voltaire