Black specks in recycled ABS are mostly caused by ash content, filter screens and carbon build-up on the screw; they are not significantly related to the amount of flame retardant added. Drawing on a real-life case involving two tonnes of waste material, this article presents a five-step troubleshooting method, organised by cost, along with a table of symptoms and their corresponding causes.
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The surface energy of flame-retardant ABS is typically 4–6 mN/m lower than that of standard ABS; this is often the cause of paint peeling in the cross-hatch test and pinholes in spray coating, and has little to do with the paint brand. This article presents three practical approaches—dynamic surface energy criteria, pretreatment, and annealing—as well as a low-cost alternative involving the “separation of appearance parts from flame-retardant parts.”