Celanex® XFR™ PBT and Riteflex® XFR™ TPC-ETPolyesters With a Halogen-free Flame-Retardant System meet the demands of current regulations and environmentally conscious manufacturers. Ticona has developed a comprehensive portfolio of halogen and antimony-free flame-resistant polyesters. The Ticona XFR grades are ideal candidates for use in electrical and electronic applications.