Silica "fire wick" rope: My thanks to carlos49 for sending me some till I found it. It's the white braided rope used on wood stove doors.
From carlos49-"A word of advice if anyone is interested, get the loosley knitted type it's a lot easier to unknit without it breakinginto little pieces.
http://www.mcmaster.com/#silica-rope/=3a9xbm
Some use the rope from hardware store kits.