Extrusion & Post
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Heat deflection temperature (HDT) of PBT injection molded parts not up to standard
Problem Phenomenon
The HDT test value of PBT products is lower than the nominal value (pure PBT about 60°C, GF30 about 205°C).
Cause Analysis
The internal stress is not fully released, causing the test value to be low, the annealing is insufficient, the glass fiber dispersion is poor, and the test conditions deviate.
Solution
Fully anneal at 120°C/2h; ensure good glass fiber dispersion; execute according to standard test conditions.
Key Takeaway
PBT HDT is affected by internal stress and glass fiber dispersion.
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