2919 - Phosphoric esters and their salts, including lactophosphates; their halogenated, sulfonated, nitrated or nitrosated derivatives:

This HTS category, 2919, encompasses phosphoric esters and their salts, including lactophosphates. It also includes derivatives of these compounds that have been halogenated, sulfonated, nitrated, or nitrosated. These are organic chemical compounds characterized by the presence of phosphorus bonded to oxygen atoms, which are in turn bonded to organic radicals. Examples include various organophosphorus compounds used in industrial processes, as plasticizers, flame retardants, or in the synthesis of other chemicals.

Distinguishing this category from its siblings is crucial for accurate classification. Unlike Chapters 01-98 which cover a vast array of goods from live animals and food products to machinery and textiles, Chapter 29, where 2919 resides, is specifically dedicated to organic chemicals. Therefore, 2919 is distinct from any categories covering inorganic chemicals, live animals, foodstuffs, or manufactured goods, focusing solely on a specific group of phosphorus-containing organic compounds.

Within this category, further subdivisions help refine the classification based on the specific chemical structure and composition of the phosphoric ester or its derivative. Subcategory 2919.10.00.00 specifically identifies Tris(2,3-dibromopropyl phosphate), a particular halogenated phosphoric ester. The residual category, 2919.90, serves as a catch-all for all other phosphoric esters, their salts, and their halogenated, sulfonated, nitrated, or nitrosated derivatives that do not fall under the more specific heading. This hierarchical structure allows for precise identification of a wide range of phosphorus-based organic compounds.