PTFE tubing (polytetrafluoroethylene) is chemically inert and suitable for low pressure applications. Typical tubing 1/16 'O.D. can support up to 62bar (900psi) and 1/8' up to 35bar (500psi). The maximum continuous operating temperature is 100°C.rrPFA tubing (perfluoroalkoxy) has excellent chemical stability and mechanical strength. The tubing of 1/16 'O.D. can support up to 100bar (1450psi), while the 1/8' O.D. can be used up to 72bar (1050psi).rIf the gas permeability is a problem, always use PFA instead of PTFE.rrFEP tubing (FluorinatedEthylenePropylene) is chemically inert to most HPLC solvents, and is recommended for low pressure applications. Usually the tube 1/16 ' O.D. can work up to 117bar (1700psi), and 1/8' O.D. supports up to 70bar (1000psi).rWe recommend FEP for ion chromatography applications.r