Production & Quality
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PPO Dimensional Change After Water Absorption
Problem Phenomenon
[Problem Phenomenon] Slight dimensional change of PPO products after use in humid-heat environments
Cause Analysis
PPO has a low water absorption (0.06-0.14%) and small dimensional change, but precision parts must still account for it; saturated water absorption of 0.14% cannot be ignored in precision fits
Solution
Reserve tolerance for precision fits according to saturated water absorption; finalize the type after humid-heat verification; select lower-absorption materials for extreme-requirement parts; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Although PPO water absorption of 0.14% is small, precision fits must still account for it; 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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