PBT is a semi-crystalline polymer used mainly for injection moulding in engineering applications.
When PET was introduced its melt processing temperature was beyond the range of most injection moulding machines at that time and PBT was introduced as a thermoplastic with many of the properties of PET but had a lower processing temperature.
PBT can match the mechanical properties of PET, particularly when reinforced with glass fibre.
PBT is well suited to thin wall mouldings.
Some PBT grades have rapid crystallisation allowing fast cycle times.
Fibre forming Polyesters were first produced in 1932 by Carothers and Hill of DuPont, with the first PBT fibres produced 10 years later in 1942. PBT compounds for moulding were launched in the 1970’s and as demand grew with new applications being found, so the number of producers also steadily increased.
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