Processing Machinery
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PSU Chemical Resistance Boundary
Fenómeno del problema
[Problem Phenomenon] PSU parts swell and craze after contacting certain solvents; chemical resistance expectations fall through
Análisis de la causa
PSU resists alkaline, salt, acidic solutions, oils, detergents and alcohols, but polar organic solvents and chlorinated aliphatic hydrocarbons erode it; selection ignoring the solvent boundary leads to failure; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solución
Check against the media list: prohibit or verify in ketone, ester, aromatic hydrocarbon, chlorinated hydrocarbon situations; solvent resistance is worse under stress, so annealing is required; conduct immersion tests for new media; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PSU chemical resistance has solvent forbidden zones; verify before use in polar solvent situations; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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