Material Drying
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PET hydrolysis resistance boundary
Problem Phenomenon
PET precision parts crack after being used in a hot and humid environment for a period of time, and the strength drops sharply
Cause Analysis
PET is not hydrolysis resistant; hot water, steam, and condensation environments hydrolyze and break the molecular chains; for continuous application scenarios of high temperature and high humidity, PET is essentially a wrong material selection; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①For hot and humid environments, switch to hydrolysis-resistant materials such as modified PBT or PA; ②when PET must be used, control the temperature and humidity exposure; ③perform accelerated aging verification for scenarios with condensation risk
Key Takeaway
PET's hydrolysis sensitivity defines the application boundary; in material selection review for hot and humid scenarios it should be vetoed outright, switching to hydrolysis-resistant materials; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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