Processing Machinery
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PPO Chemical Resistance Failure
Problem Phenomenon
[Problem Phenomenon] PPO parts swell and fail in aromatic hydrocarbon, halogenated hydrocarbon and oil environments
Cause Analysis
PPO resists inorganic acids and alkalis but has poor resistance to aromatic hydrocarbons, halogenated hydrocarbons and oils, easily swelling or stress cracking; selection ignoring media boundaries leads to failure; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Check the use environment against the media list; select PPO/PA alloy GTX for chemical resistance requirements; conduct immersion verification for sensitive media; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO fears aromatic hydrocarbons, halogenated hydrocarbons and oils; switch to GTX alloy for chemical resistance occasions; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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