FEP coated with PVDFPrevents "re-gassing"Excellent chemical resistancePTFE and FEP have very good chemical resistance, but are too permeable to be suitable for mobile phase transfer lines. PVDF, on the other hand, lacks chemical resistance but is a very tight polymer with no observable micropores. Our impermeable tubing is produced by co-extruding PVDF over FEP to combine the best features of both polymers, ensuring that degassed solvent will stay degassed until it reaches the HPLC pump. NOTE: To Order or Request a Quote for tubing sold as Per Foot or Per Meter, please add the product to your cart. By clicking on the PENCIL ICON beside the Product Number, you may then enter the length required in the Product Comments box.