Material Drying
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PA6 Flame-Retardant Grade Drying
Problem Phenomenon
When flame-retardant PA6 is dried at 100°C, particle agglomeration and color darkening occur
Cause Analysis
Some flame retardants (especially bromine-based and nitrogen-based) begin to soften or decompose at around 100°C; excessively high drying temperature causes the particle surface to become sticky and agglomerate, and flame retardant decomposition causes discoloration
Solution
The drying temperature of flame-retardant PA6 is controlled at 80-90°C according to supplier guidance, for 4-6 hours; when agglomeration occurs, lower the temperature and turn the material layer; when discoloration is severe, stop using that batch of material
Key Takeaway
The drying temperature of flame-retardant grades is limited by the temperature resistance of the flame retardant, and conventional conditions cannot be copied directly; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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