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Polybutylene Terephthalate (PBT) is a semi-crystalline, white or off-white polyester it is resistant to solvents, shrinks very little during forming, is mechanically strong, heat-resistant up to 150 °C (or 200 °C with glass-fibre reinforcement) and can be treated with flame retardants to make it noncombustible.

4DUR® is the registered trade mark for Polybutylene Terephthalate (PBT) compounds produced by 4PLAS. We offer a wide range of PBT compounds as well as a range of PBT/PET, PBT/ASA and PBT/PC blends.


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4DUR® compounds offer the following key properties:

  • Excellent stiffness and hardness
  • Good mechanical strength
  • Good creep and fatigue behaviour
  • Very good thermal stability
  • Excellent flammability resistance
  • Good electrical properties
  • High wear resistance and low friction
  • Good dimensional stability
  • Very good chemical resistance
  • Excellent flow and processing properties
  • Low moisture absorption
  • Very good surface finish


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With the addition of a wide range of modifiers, stabilisers, speciality additives and customised colours, 4DUR® can be compounded as:

For individual grades or to search using a wide range of criteria please use our interactive material selector.

Our standard range is comprehensive, however should you not find what you are looking for within the data available on this website, we offer Custom Compounds to suit the requirements of specific applications.

If you would like advice on selecting suitable materials, or you cannot find what you are looking for, please contact us and one of our team will be pleased to assist you.

4Plas Account

An account provides you with full online access to data and documentation for all 4PLAS materials, the 4PLAS brochure, plus the facility to print and download any document.