Molding Process
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PPS Chemical Resistance Applications
Problem Phenomenon
Chemical pump and valve parts made of other plastics are corroded by solvents; after switching to PPS, they remain stable long-term
Cause Analysis
PPS has excellent chemical resistance: below 200°C it is almost insoluble in any solvent, resistant to acids, alkalis, oils, and fuels; only strong oxidizing acids (concentrated nitric acid, concentrated sulfuric acid) can attack it
Solution
①Prioritize PPS for chemical contact scenarios; ②Conduct compatibility verification in strong oxidizing acid environments; ③Confirm boundaries according to medium concentration and temperature; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS's chemical resistance spectrum is second only to fluoroplastics; being insoluble in any solvent below 200°C is its signature advantage; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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