The product is a flame-retardant masterbatch in granulate form, which is used in construction (e.g. processing in insulation material). The product is stated to be composed of polystyrene, brominated flame retardant decabromodiphenylethane and other additives. The product is offered in big bags with a capacity of 1000 kg.
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[1][1]. BEBTID.T.316.592#752107
The mixture, identified as product code ADD FR 584 is composed of 51% Decabromodiphenyl oxide, 25.5% Antimony trioxide, 17.8% Ethylene vinyl acetate and 5.7% Calcium zinc stearate. The product is a flame retardant masterbatch additive used to reduce the flammability of products molded from polyethylene. The product is a chemical mixture of inorganic and organic compounds containing over 5% of an aromatic substance.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N057685