Production & Quality
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PVDF Failure in Strong Alkali and Ketone Media
Problem Phenomenon
【Problem phenomenon】PVDF parts swell and crack in strong alkali or ketone solvent environments, and the chemical resistance advantage fails
Cause Analysis
PVDF has excellent resistance to strong acids and oxidants, but strong alkalis, ketones (acetone), and ethyl acetate can attack and swell it, and strong polar solvents such as DMF/DMAc/NMP/DMSO can dissolve it; material selection ignoring media boundaries leads to failure
Solution
Check the use environment against the media list, and switch to perfluorinated materials such as PFA for strong alkali and ketone occasions; verify new media by immersion testing first; consider swelling allowance in pipeline design
Key Takeaway
PVDF chemical resistance has clear boundaries; strong alkali and ketone media require material change or verification; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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