Two comments in followup.
A) you can get the high temp ties from mcmaster carr as well. Look for the "harsh environment" versions, they are made ofTefzel. They are not cheap tho. If memory serves me correctly, they are about .70 each for the small narrow, short version and go up from there.
b) you can also get the spiral wrap from mcmaster, in either *white* or *black*, but *make sure you get the PTFE version*, it's good to 500 degrees, the other is only good to 200 (including the nylon)
Hope this helps,