Material Analysis
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PBT Chemical Resistance Boundary
Problem Phenomenon
PBT parts are eroded and crack after contacting halogenated hydrocarbons, while contacting grease and solvents causes no harm
Cause Analysis
PBT has excellent oil resistance and chemical resistance; but it is easily eroded by halogenated hydrocarbons; strong acids, strong alkalis, and water vapor also decompose the ester bonds; chemical environments need to be verified according to the medium
Solution
①PBT is forbidden in halogenated hydrocarbon environments; ②Evaluate substitutes for strong acid, strong alkali, and water vapor scenarios; ③Use with confidence in grease and solvent environments; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT's selective chemical resistance boundary lies in halogenated hydrocarbons and strong acids and alkalis; medium list review is a required course for material selection; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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