We tried and tried to find suitable PTFE high temperature cable for an automotive diagnostics application and ended up having it made for us, it was PTFE tape wrapped and cost us around £3 a metre but we had to buy a lot of metres worth (5000 ISTR) so if you need a lot it might be worth opening a conversation with a custom cable company?
What automotive application needs crotical cabling parameters?
I'm interested to know, as I can't think of anything that can't be handled by the usual PVC coated wire.
It wasn't an automotive application, that'd be fine with high temp or even normal spec PVC, it was an automotive diagnostics application, specifically an insertion probe that measured engine oil temperature which is outside the temperature range of 'usual' PVC which only does 70C, high temperature PVC is not up to the job either, it's usually only good to 130C* and degrades fairly quickly when exposed to the mixture of hot hydrocarbons in an engine sump.
Non contact methods were not acceptable, by regulation and/or client specification.
PTFE was ideal, oil resistant, 130C is just a mild spring day for it, it's slippery so it doesn't snag, it doesn't degrade and leave lumps of material in the engine to clog the oilways (unless some muppet managed to get it wrapped round the crankshaft) and when all things were considered, it really wasn't expensive compared to the other options which were either fatter, too stiff or not stiff enough and were working at the extremes of their specification anyway.
*130C is getting to the extreme upper end of 'normal' engine oil temperatures for road vehicles but some of our clients were running engines in ways where extremes could be more the norm.
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