Material Analysis
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PPO Low-Warpage Grades for Precision Parts
Problem Phenomenon
[Problem Phenomenon] Warpage of precision structural parts exceeds the standard, and standard PPO grades are difficult to meet the requirements
Cause Analysis
PPO has low-warpage grades (HS2000 containing 20% filler) designed specifically for warpage-sensitive parts; the low shrinkage of 0.2-0.7% as a basis combined with filler further stabilizes dimensions
Solution
Select low-warpage filled grades for warpage-sensitive parts; use mold flow analysis to assist gate design; verify first-article flatness by CMM; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO low-warpage grades are the answer for precision parts, and HS2000-type grades are optional; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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