Compounding technology for
Polybutylene terephthalate (PBT) and
Polyethylene terephthalate (PET) Compounds

PET and PBT polymers belong to the polyesters family. PET can be in the form of an amorphous moulding compound (PET-A) or a semicrystalline material (PET-C). PBT is considered to be partially crystalline. Both PET and PBT are thermoplastics and produced by polycondensation. They belong to the group of technical synthetics, often called engineering plastics. This is due to their main strengths and application fields: for technical or engineering components with challenging mechanical, thermal and electrical requirement profiles, and chemical resistance.

PET / PBT were first mass-produced in England in the 1940s. Their original uses in textiles and fabrics of all kinds have been extended to injection moulding and extrusion applications. Due to its faster crystallization, PBT is mainly used for injection moulding applications. PBT compounds optimally combine stiffness and strength with good toughness and heat resistance as well as dimensional stability, even in challenging environments. This makes them an important material in the electronics/electrical, automotive and aerospace industries among others, with predicted growth of 5-7% p.a.