Material Drying
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PA66 flame-retardant grade drying
Problem Phenomenon
Flame-retardant PA66 dried at 90℃ then injection molded shows foaming and flame retardancy decline
Cause Analysis
Some halogen-free flame retardants (such as hypophosphites) are sensitive to heat and humidity; improper drying conditions decompose the flame retardant, both foaming and losing flame retardant efficiency; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Flame-retardant grades dried per supplier-specified conditions, generally 80℃×4 hours; use immediately after opening; moisture-affected material must not be used for flame-retardant products; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Flame-retardant grade drying conditions follow supplier guidelines, conventional conditions cannot be applied; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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