Material Drying
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PCABS moisture content 0.02% red line
Problem Phenomenon
【Problem Phenomenon】PC/ABS drying released by experience, moisture content exceeding the standard caused batch silver streaks
Cause Analysis
PC/ABS moisture content must be ≤0.02%, the same level as pure PC; trace moisture at 240-280℃ causes PC hydrolysis and molecular weight decrease, appearance silver streaks and strength loss occur simultaneously
Solution
Moisture meter actual measurement ≤0.02% for release; extend drying in high-humidity seasons; dry regrind separately and verify; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
0.02% is the PC/ABS moisture red line, release by actual measurement not by experience; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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