Material Drying
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PA66 electrical performance moisture absorption
Fenómeno del problema
Electrical insulation parts have decreased insulation resistance in humid environment, and withstand voltage test is marginally qualified
Análisis de la causa
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
Solución
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
Conclusión clave
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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