Material Analysis
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PSU Grade Selection Mistake
Problem Phenomenon
Performance differences among PSU grades cause application failure; high Tg grades are difficult to process; low-viscosity grades have insufficient strength.
Cause Analysis
PSU grades differ greatly in molecular weight and modification components; processability and mechanical properties trade off; selection based only on price or a single indicator; insufficient matching with application conditions.
Solution
①Systematically evaluate grades according to application conditions; ②Obtain grade technical data sheets; ③Trial molding to verify processability; ④Performance testing confirmation.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU grade selection is a trade-off between performance and processability; data sheets and trial molding verification are both emphasized; matching with operating conditions is fundamental.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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