The glass-reinforced polybutylene terephthalate is becoming increasingly more popular in machine design applications.
Why choose it?
- A good option for machine design applications.
- It does not absorb moisture (unlike PA6 and PA66).
- Good dimensional stability.
- Low tendency to creep.
- It provides good surface quality.
Why not choose it?
- The product is exposed to boiling water for long periods. Polyesters are prone to hydrolysis.
- If high temperature, oil, and rattling are involved, PA might be a better choice.
Typical applications:
- Electric connectors
- Windshield wiper arms
By examining the Plasticprop sample made of PBT + 30 GF, you can draw for example the following conclusions:
- The greatest difference compared with the respective PA sample is the better surface quality of PBT over the glossier area. The PET mixed into the raw material could well be the cause of this. The neatness of the product can be somewhat affected by process characteristics.
- The small distortions and a considerable corner effect are clearly visible and also typical for glass-reinforced semi-crystalline plastics.
- The spark-eroded draft surfaces remain very neat. However, in using glass-reinforced semi-crystalline plastics, the need for draft should not be underestimated based on this.