2919.90 - Other:

This HTS category, 2919.90, encompasses a range of phosphoric esters and their salts, along with their modified derivatives (halogenated, sulfonated, nitrated, or nitrosated), that do not fall under the more specific classification of tris(2,3-dibromopropyl phosphate). These substances are organic chemical compounds characterized by the presence of a phosphate group linked to organic radicals, and can include various salts or derivatives resulting from further chemical modifications. Their applications can be diverse, often found as plasticizers, flame retardants, or as intermediates in the synthesis of other chemical products.

The primary distinction of this category lies in its residual nature, serving as a catch-all for phosphoric esters and their derivatives not explicitly listed elsewhere. Unlike the sibling category 2919.10.00.00, which specifically identifies tris(2,3-dibromopropyl phosphate), this heading is for all other such compounds. This implies that any phosphoric ester or its derivative not meeting the precise chemical structure of tris(2,3-dibromopropyl phosphate) would be directed to this broader classification.

Within this "Other" classification, further subdivision exists to provide more granular control. The subcategory 2919.90.50, for instance, is designated for "Other" within the context of aromatic derivatives. This suggests that the parent category itself may contain, or be further refined by, distinctions based on the aromatic nature of the organic component of the phosphoric ester. Such subdivisions are crucial for precise tariff application, reflecting specific chemical structures and potentially different trade implications or duty rates.