Material Drying
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PA6 Hydrolysis Aging
Problem Phenomenon
PA6 coolant pipes embrittle and crack after two years of use in hot water and antifreeze environments
Cause Analysis
PA6 amide bonds hydrolyze in high-temperature water and ethylene glycol environments, and the continuous molecular weight decline causes embrittlement, with the hydrolysis rate roughly doubling for every 10°C temperature increase; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Select hydrolysis-resistant grades for hot water medium environments or switch to high-temperature nylon such as PPA; water-contact parts with working temperature over 70°C must undergo long-term hydrolysis verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
High-temperature water contact is a sensitive service condition for PA6, and hydrolysis-resistant grades are a necessary choice; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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