Fiberglass-filled PBT

Glass fiber diameter can also affect the physical properties. In general, fiber diameters from 6-17. im have been used in PBT, with the narrower fibers giving slightly better properties. However, fiber length distribution and fiber content may play a more important role than diameter [32], Fiber content in a PBT composite is often measured by specific gravity and by ash content. Both of these measurements need to be corrected in cases where the blend is pigmented or combined with other materials. 

In addition to glass fibers, PBT can also be reinforced with carbon fibers. Many of the general trends seen with glass fibers are also observed with carbon fibers. One important aspect of carbon fibers is that they may bring electrical conductivity to PBT if sufficient fiber connectivity is achieved in the final part. Metal fibers and metal-coated carbon fibers have also been compounded with PBT, giving not only improved mechanical properties but also molded parts with enhanced ability to shield components from electromotive and radiofrequency interference (EMI-RFI) [33], 

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