Material Drying
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TPU product hydrolysis resistance selection
Problem Phenomenon
Short product life in humid environments.
Cause Analysis
Polyester-type TPU has poor hydrolysis resistance; polyether-type should be selected for humid environments; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
①select polyether-type TPU for humid environments; ②do hydrolysis aging tests; ③evaluate the use environment; ④confirm the grade with the supplier; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hydrolysis resistance selection is the first decision for humid environment applications; polyether-type is the standard answer; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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