2.5mm X 4mm PTFE Tubing - TPTFE-04/025-10M Unique properties of PTFE are excellent. Enjoying a non-stick/low friction release property and a very wide temperature range, it is virtually inert to all known chemicals and solvents. It exhibits extremely good electrical insulation properties and good weatherability. All these characteristics combined make PTFE the ideal material for innumerable applications. Please note: No recommended burst pressures/working pressures due to hose being unreinforced.