Polybutylene terephthalate


220 ° C ( crystalline form α )

47 ° C.

1700-2700 N · mm -2

Polybutylene terephthalate ( PBT abbreviation ) is a circa 1941 for the first time produced thermoplastic. It is one of the polyesters, and has properties similar to polyethylene terephthalate ( PET), however, is more suitable for injection molding due to the better cooling and process behavior.


Polybutylene terephthalate is estimated (significantly better than that of POM or PA) and good friction and wear properties due to its high strength and stiffness, very high dimensional stability. Typical temperatures are in the range -50 to 150 ° C.

PBT has a good chemical resistance to many solvents. At room temperature it can not be dissolved at elevated temperatures, for example, mixtures of ortho -dichlorobenzene and phenol. It is sensitive to molecular weight degradation by hydrolysis, but can be briefly brought into contact with hot water, and is therefore used for example in steam irons and coffee machines.


Polybutylene terephthalate is used for housing in electrical engineering, but also in the vehicle as connectors and in the household, for example, as a shower head or shower in iron. Processed into fibers, it is found for example in toothbrushes or in the sheathing of optical waveguides again. In 2003, around 420,000 tonnes of PBT were consumed worldwide, including about 150,000 tonnes in Western Europe.

Trade names

  • Anjacom ( almaak international GmbH )
  • Arnite (DSM )
  • Celanex ( Ticona )
  • Crastin (DuPont )
  • DYLOX ( Hoffmann Voss GmbH)
  • Kebater ( BARLOG plastics GmbH )
  • Later ( LATI )
  • Pocan ( Lanxess )
  • RIALOX ( RIA Polymers GmbH )
  • Schuladur (A. Schulman )
  • Ultradur (BASF )
  • Valox ( Sabic Innovative Plastics)
  • VESTODUR (Evonik Industries AG )