Material Drying
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PA66 hot water hydrolysis
Problem Phenomenon
PA66 hot water pipe joints crack brittlely and leak after two years of use
Cause Analysis
High-temperature hot water hydrolyzes amide bonds, molecular weight continuously decreases, and the material gradually embrittles; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Switch to hydrolysis-resistant grades or PPA for long-term hot water contact; long-term hydrolysis verification is mandatory for working temperatures above 80℃; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Material selection for high-temperature water conditions must consider hydrolysis life; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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