Used Commercial

Are pvc wires still used in commercial aircrafts?

Hi I am doing a science fair project on the thermal degredation of 3 different wire samples that are commonly used in commercial air crafts. I was wondering if PVC is still used in aircraft systems.
BTW I am only in seventh grade.
Please help.

There is aircraft grade wiring still available for sale that has PVC insulation (MIL-W-5086) but I don’t think it is used for new aircraft.

There are plenty of old planes out there with original wiring and they could possibly have PVC wiring. I haven’t heard of any program to replace the wiring in aircraft based on the type of wire other than replacing aluminum wire with copper.

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