Material Analysis
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Fiber content inspection inaccurate
Problem Phenomenon
The fiber content measured by the ashing method fluctuates from the formulation value by >3%
Cause Analysis
PP does not pyrolyze completely during ashing, leaving carbides causing high mass; the glass fiber itself loses mass during high-temperature ashing (>600°C); sampling representativeness is insufficient
Solution
Standardize ashing conditions (constant temperature at 550°C for 2 hours); use TGA (thermogravimetric analysis) to accurately measure each component; take samples at multiple points and mix to improve representativeness
Key Takeaway
Fiber content is the core indicator of LGFPP quality inspection, and the inspection method needs to be standardized
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