Material Drying
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PBT vs PA Comparison
Problem Phenomenon
Material selection between PBT and PA66 is a dilemma, and the dimensional stability requirements in humid environments are different
Cause Analysis
PBT has small water absorption and stable dimensions, and its electrical performance barely changes in humid environments; PA66 absorbs much water and its wet-state performance drifts; PBT's toughness and hydrolysis resistance are inferior to modified PA; select according to humidity and toughness requirements
Solution
①Select PBT for humid precision electrical parts; ②Select toughened PA for high toughness requirements; ③Hydrolysis resistance requirements both need dedicated grades; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT's core advantage over PA is wet-state dimensional stability; the material selection balance for electrical precision parts tips toward PBT; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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