Polybutylene terephthalate is a semi-crystalline material from the polyester family of plastics and, due to its good thermal and mechanical properties, is counted among the polymer group of engineering plastics. It has a high surface hardness and good sliding and wear behaviour.

The mechanical properties of Polybutylene terephthalate comprise hardness, stiffness, stability and toughness. In particular the material’s extremely high toughness allows the use of self-tapping screws or inserts. The good sliding properties and the high dimensional stability also open up a wide range of possible applications. Very good results can be achieved in joining processes with two-component adhesives on the basis of e.g. epoxy resins or cyanoacrylates as well as silicones. Painting of the part or high vacuum coating of the component surface is also possible. The continuous operating temperature ranges from approx. -60 °C to +130 °C. Like all polyesters, PBT is not resistant to hot water (from approx. +60 °C) in the long term.

Properties GEHR PBT®

Product range

  • High stability, stiffness and toughness, even at low temperatures
  • Good creep resistance
  • High surface hardness
  • Good polishability
  • High dimensional stability
  • Easy to metallize
  • Good sliding properties
  • Good electrical insulation characteristics
  • High resistance to chemicals
  • Easy to paint
  • Good UV and weather resistance
  • Sensitive to hydrolysis


  • Components with metal inserts
  • Pump components
  • Housing components
  • Tank caps
  • Gear wheels
  • Insulating parts in electrical engineering
  • Applications with UV exposure
  • Fixings and spacers
  • Guide rails and wheels, sliding bearings
  • Pump and sealing bodies, roller conveyors
  • Valves
Downloads GEHR PBT®

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