Polybutylene terephthalate (PBT)
Polybutylene terephthalate (PBT) is an engineering thermoplastic. It belongs to the group of polyesters and shows excellent process behavior in injection molding.
PBT is often used for multi-component components. In a subsequent process, the components are coated, printed or bonded. However, since the surface energy of PBT is relatively low, this step is preceded by plasma treatment. This adhesion improvement increases the surface energy of the substrate, resulting in a good end result.
PBT is appreciated for its firmness and stiffness, its very high dimensional stability (much better than that of POM or PA) and its good friction and wear resistant properties. Typical application temperatures range from -50 to 150 °C (-60 to 300 °F).
Applications are found in the construction of casings in electrical engineering, for plug connections, in vehicle manufacturing and for components of household appliances that are subject to thermal stress.