Yep, hence why I made sure to get the data sticker in the photo for the really curious. Also why I do "spot" tying instead of running the string all the way down the bundle, since that uses more string.

It's certified for high temp areas around exhaust,etc and hence non waxed (wax helps hold a knot). I normally worked on stuff outside of the fuselage which is where the more common waxed string is used. But obviously around engine areas, only certain string was certified. We also had to use high temp sting inside the leading edges of the wings (which is where a majority of all the wire is) since the bleed air ducts run through there too and cause higher temps (though not sure how high)