Material Drying
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PA66 electrical performance moisture absorption
Problem Phenomenon
Electrical insulation parts have decreased insulation resistance in humid environment, and withstand voltage test is marginally qualified
Cause Analysis
After PA66 absorbs water, volume resistivity decreases significantly, and electrical performance drifts with moisture content; insulation designs qualified in dry state may fall below the safety margin in wet state; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
①Design electrical parts according to wet-state insulation data; ②Select low water absorption grades or apply moisture-proof treatment for high-humidity environments; ③Perform insulation verification in conditioned state; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 electrical performance must be checked in wet state; designing insulation with dry-state data is a hidden risk, moisture protection and material selection provide double insurance; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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