Material Analysis
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Performance decline of PBT products in high-temperature and high-humidity environments
Problem Phenomenon
The mechanical properties of PBT products decline significantly after aging in high temperature and high humidity (such as 85°C/85%RH).
Cause Analysis
PBT degrades (hydrolyzes) under hot and humid conditions, the molecular weight decreases and whitens, and glass fiber reinforced products degrade more severely due to interface damage.
Solution
Add anti-hydrolysis agents; select hydrolysis-resistant PBT grades; consider sufficient performance margin in design.
Key Takeaway
PBT has limited hot and humid resistance and needs anti-hydrolysis stabilization.
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