Material Drying
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PBT Hydrolysis-Resistant Grade Application
Problem Phenomenon
Automotive humid-environment PBT parts have insufficient service life, with complaints of premature failure of ordinary grades
Cause Analysis
Hydrolysis-resistant grades such as 733LD achieve hydrolysis resistance through end-capping and stabilizer systems; humid environment applications must select hydrolysis-resistant grades, ordinary grades are not applicable; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①For humid environments select hydrolysis-resistant grades; ②Verify service life by damp-heat aging test; ③Hydrolysis-resistant grade is mandatory for critical parts such as electrical connectors; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hydrolysis-resistant grades are the admission ticket for PBT damp-heat applications; aging verification data is the basis for material selection; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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