Production & Quality
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PA66 chemical resistance boundaries
Problem Phenomenon
PA66 parts are corroded and powdered on the surface after contacting strong acids or oxidants, yet are unharmed when contacting oils
Cause Analysis
PA66 is resistant to oil, fuel, and most solvents, but not resistant to strong acids and oxidants, and amide bonds are rapidly degraded; misjudgment of the chemical environment will lead to batch early failure
Solution
①Perform compatibility verification first for chemical contact scenarios; ②Switch to PP or fluoroplastics for strong acid and oxidant environments; ③PA66 can be used with confidence in fuel and engine oil environments; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 chemical resistance is a selective advantage; the boundary of oil resistance but not strong acid resistance must be confirmed item by item in material selection review; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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