Material Drying
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PBT Low-Warpage Grade
Problem Phenomenon
Large-size glass fiber PBT parts have warpage out of tolerance, and switching to ordinary grades cannot solve it
Cause Analysis
Low-warpage grades such as Polyplastics 733LD achieve low warpage through PBT/SAN alloying and formulation optimization; 30% glass fiber reinforcement combines strength, hydrolysis resistance, and dimensional stability
Solution
①For large-size precision parts select dedicated low-warpage grades; ②Compare and verify according to warpage data; ③Cooperate with the supplier to customize anti-warpage solutions; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low-warpage grades are the mature answer for large-size glass fiber PBT parts; material selection is more effective than process compensation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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