PTFE cords can be used in temperature extremes of -400F to +550F as well as in chemical environments. PTFE (polytetrafluoroethylene) is highly resistant to burning, rotting and fungi. PTFE cord is very flexible and has a high knot strength. This particular type of plastic cord stock is a good electrical insulator because of its low-friction characteristics. It resists sticking and can be used indoors or outdoors. PTFE products also include PTFE Rods and PTFE Sheets.