Semicrystalline thermoplastic material. The polymer structure is closely related to that of polyethylene terephthalate. Both are based on an aromatic monomer and are a type of polyester. The blend of PBT/PET also plays a role in technology, but its properties and applications differ considerably. While PET, depending on the processing, can also be largely amorphous (e.g. beverage bottles), PBT is always crystalline to a large extent. Accordingly, it has a greater hardness and rigidity and is never transparent. PBT is primarily used for technical injection moulding parts. Also the fibre-reinforced type is very important due to the relatively good fibre-matrix bond. PBT is often used for multi-component parts, and it is glued, printed and coated. Its bonding strength is optimised by plasma cleaning and plasma activation. optimiert.