Material Drying
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PC Hydrolysis Resistance
Problem Phenomenon
[Problem Phenomenon] PC performance declines under long-term use in hot and humid environments
Cause Analysis
PC hydrolysis resistance is average; high temperature and high humidity cause hydrolysis, de-esterification and strength reduction; hot-humid conditions require hydrolysis-resistant grades or control of the service temperature; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solution
Select hydrolysis-resistant grades for hot-humid parts; long-term hot-humid aging verification; drying in processing to preserve molecular weight; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
PC fears high temperature and high humidity; hydrolysis-resistant grades are more stable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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