2920.19 - Other:

This HTS category, 2920.19, encompasses a specific group of organic chemicals: thiophosphoric esters, also known as phosphorodithioates, and their salts. These compounds are characterized by containing sulfur, phosphorus, and oxygen atoms arranged in ester linkages. The classification extends to derivatives of these thiophosphoric esters and their salts that have undergone halogenation, sulfonation, nitration, or nitrosation, meaning additional functional groups have been added to the molecule through these chemical processes.

Distinguishing this category from its sibling, 2920.11, is crucial. While both fall under thiophosphoric esters, 2920.11 is exclusively reserved for specific insecticides, namely Parathion (ISO) and parathion-methyl (ISO) (methyl-parathion). Therefore, 2920.19 covers all other thiophosphoric esters and their derivatives that are not these particular pesticidal compounds, including those used in other applications like lubricants, flame retardants, or as intermediates in chemical synthesis.

Within this category, further subdivisions exist. The subcategory "Aromatic" (which implicitly leads to further specific classifications, though not detailed here) would cover thiophosphoric esters where the esterifying alcohol or phenol is aromatic in nature. The remaining subcategory, 2920.19.50.00 "Other," serves as a residual category for any thiophosphoric esters and their derivatives not classified under the "Aromatic" subdivision or the specific sibling entry. This ensures comprehensive coverage for all compounds within the broader scope of thiophosphoric esters.