Material Drying
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PA6 Product Hydrolysis Resistance Requirement Failure
Problem Phenomenon
PA6 parts used in humid and hot environments degraded rapidly in performance and strength declined.
Cause Analysis
Ordinary PA6 has limited hydrolysis resistance, and molecular weight declines under long-term humidity and heat; hydrolysis-resistant grades should be selected; humid and hot environments are a severe test for ordinary PA6; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Select hydrolysis-resistant modified grades for humid and hot uses;②perform humid heat aging verification;③leave performance margin in design;④do a good job of sealing and moisture-proofing, and control environment and storage humidity;⑤evaluate alternative materials.
Key Takeaway
PA6 'humid and hot environment = hydrolysis-resistant grade threshold': ordinary nylon cannot withstand long-term humidity and heat; the environment must be matched at the material selection stage, and post-remediation is ineffective; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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