Material Drying
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PA6 Moisture Content Measurement Method
Problem Phenomenon
The moisture content measured by the weight-loss method differs significantly from the Karl Fischer method, and it is unclear which to use as the standard
Cause Analysis
The weight-loss method measures total volatiles (including monomer and additive volatilization), giving a high value; the Karl Fischer method is highly specific and measures only water, giving more accurate results; the difference is caused by the different principles of the two methods
Solution
PA6 moisture content arbitration is based on Karl Fischer titration, and the weight-loss method can be used for rapid on-site screening; during rapid screening, note that the weight-loss method reading needs to deduct the additive volatilization background
Key Takeaway
Results from different water measurement methods cannot be directly compared, and arbitration uses the Karl Fischer method; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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