Material Drying
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Dimensional Stability Advantage of PA12 Low Moisture Absorption
Problem Phenomenon
【Problem phenomenon】PA6/PA66 products expanded beyond tolerance after moisture absorption, and a dimensionally stable nylon substitute was sought
Cause Analysis
The equilibrium moisture absorption rate of PA12 is only 0.25-0.9%, while PA6/PA66 reaches 2.5-3.5%; low moisture absorption keeps PA12 wet-state dimensions and performance stable, making it the first choice for precision nylon parts
Solution
Switch precision nylon parts in humid and hot environments to PA12; recalculate dimensional tolerances according to the difference in moisture absorption rate; glass fiber reinforced PA12 further reduces shrinkage and moisture absorption influence; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Moisture absorption 0.25-0.9% versus 2.5-3.5%, PA12 is the dimensionally stable nylon answer; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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