Valox 420SE0 Polybutylene Terephthalate (PBT) resin is a 30% glass fiber reinforced, injection moldable grade. This brominated flame retardant PBT has a UL V0 and 5VA rating. Valox 420SE0 resin is a general purpose resin that is an excellent candidate for a wide variety of applications including electrical components, bobbins, switches, stators, commutators and cooling fans.