Injection Molding
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Flame retardant ABS mold corrosion and precipitation
Fenómeno do problema
After flame retardant ABS '2079851475616104452, rust spots appear on the mold surface, foggy precipitates appear on the product surface, and corrosion is faster at trapped air areas.
Análise das causas
Flame retardants (especially bromine/halogen systems) decompose and release corrosive gases when overheated or retained too long, which corrode the mold surface when encountering water vapor and precipitate on the product surface; the processing window of flame retardant materials is narrower.
Solução
①Strictly control the melt temperature not to exceed the grade's upper limit and shorten the residence time; ②use corrosion-resistant steel or coating for the mold; ③strengthen venting; ④replace the barrel with pure ABS or purging material before each shutdown; ⑤select a low-precipitation flame retardant system.
Conclusão principal
Flame retardant ABS='narrower processing window + stronger mold protection': temperature control, corrosion prevention, strong venting, and shutdown replacement—the four-piece set is indispensable; flame retardant materials are more demanding on equipment and process.
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