https://www.fluoropolymer-resin.com/products/fep-resin/ FEP is the copolymer of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP). With good thermal stability, prominent chemical inertness, desirable electrical insulation, and low friction coefficient, it can be processed with thermoforming technique. Grades are classified by different melting flow rate (MFR).All Rights Reserved