Processing Machinery
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PSU Chemical Resistance Boundary
Problem Phenomenon
PSU products show stress cracking and performance decline after contacting certain chemicals; media compatibility was not fully verified during material selection.
Cause Analysis
PSU has good chemical resistance but with boundaries; polar solvents and specific media can erode it; internal stress and media synergistically cause cracking; concentration and temperature affect erosion rate.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
①Conduct immersion compatibility tests with actual media; ②Low-stress molding; ③Control contact concentration and temperature; ④Establish a media compatibility database.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU chemical resistance must be verified for specific media; generic data sheets cannot replace operating-condition tests; stress management reduces cracking sensitivity.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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