Molds & Tooling
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PPS Mold Steel Selection
Problem Phenomenon
PPS mass-production mold life drops sharply, cavity wear and corrosion coexist, and flash increases
Cause Analysis
PPS sulfur-containing high-temperature melt is abrasive and mildly corrosive to molds; ordinary mold steel is not durable; SKD-11, SKD-61, SUS440, etc. should be selected and heat-treated to HRC55-60
Solution
①Use SKD-11/SKD-61/SUS440 steel for molds; ②Heat treat to HRC55-60; ③Accept molds for glass fiber grades according to high-abrasion conditions
Key Takeaway
PPS mold material selection is a triple requirement of heat resistance, wear resistance, and corrosion resistance; HRC55-60 is the baseline for mass-production life; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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