This MicroSolv, ETFE (Tefzel) Tubing, is extruded from virgin ETFE and additives are not added to the original material. This tubing is used widely in all low-pressure, laboratory applications including before and after an HPLC Pump such as with Mobile Phase Delivery and Solvent Waste Systems. ETFE tubing is chemically inert except for some halogenated compounds and has low permeability compared with PTFE tubing.