Material Analysis
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PEI Thin-Walled Part Filling
Problem Phenomenon
PEI thin-walled connectors are difficult to fill; standard PEI cannot fill ultra-thin sections, forcing material changes or design modifications.
Cause Analysis
PEI's high viscosity makes filling of ultra-thin walls (such as below 0.3mm) approach the physical limit of the material; standard grades have insufficient flowability; dedicated high-flow grades (such as GF15 modified high-flow grade) can improve but involve performance trade-offs.
Solution
①Evaluate dedicated high-flow grades; ②optimize gates and runners to the limit; ③utilize the upper limits of injection speed and pressure equipment; ④when truly infeasible, change the design or reselect the material.
Key Takeaway
PEI ultra-thin walls are a material limit challenge; high-flow grades are a feasible path; the trade-off between material performance and processability requires systematic evaluation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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