Allen Tech PTFE tubing is made of PTFE (Polytetrafluoroethylene),PTFE tubing can be used in extreme temperatures and in harsh chemical environments. It's chemically inert, has low permeability, and has the lowest friction coefficient of any tubing. Temperature range is -450 to 500°>F; melts at 620°>F. Allen Tech PTFE tubing is UL-recognized (Flame rating: UL-224 VW-1), Excellent resistant to acids, alkali and all kinds of organic solvents: ASTM D543, and Raw materials meet FDA requirements per FDA 21 CFR 177.1550 for use with food contact surfaces. Widely used in electronics, chemicals, medical and industrial