Material Analysis
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Additive Precipitation of PBT
Problem Phenomenon
After long-term storage of PBT products, white powdery precipitates appear on the surface.
Cause Analysis
Additives (slip agents, antioxidants, etc.) have limited solubility in the matrix and migrate to the surface over time and precipitate (blooming).
Solution
Control the amount of additives within the solubility range; use high molecular weight additives to reduce the migration rate.
Key Takeaway
PBT precipitates affect appearance and electrical properties.
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