I've recently started making cannon wire harnesses using MIL-W-16878/4 Type E Stranded Wire. If you are unfamiliar with this type wire, it's the same wire that's you will find in military electronics. The wire insulation is Extruded Polytetrafluoroethylene (PTFE) and allows for use in high temperature environments and protects the wire against abrasion, chemicals, oils, solvents, and solder damage, and it's flame and moisture resistant. The conductor is 19 strands of 34 gauge silver plated copper, this makes the wire very flexible, low loss, and expensive.
I've actually place my soldering iron (@600F) directly on the PTFE insulation for several seconds and the insulation remained undamaged.
The upside, this cable should last forever.
The downside, this wire is 3x as expensive as standard 7/30 PVC coated tin plated copper wire.
The questions: Do you think this is overkill for the application? At $55/pair are these harnesses over priced?