Processing Machinery
1 views
PSU Chemical Resistance Boundary
Problem Phenomenon
[Problem Phenomenon] PSU parts swell and craze after contacting certain solvents; chemical resistance expectations fall through
Cause Analysis
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
Solution
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
Key Takeaway
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
Was this helpful?
0 people found this helpful
Thank you for your feedback!