2917.39 - Other:

This category, 2917.39 "Other," under "Aromatic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives," encompasses a range of these compounds that are not specifically listed under preceding subheadings within the 2917.30 series. It is designed to capture aromatic polycarboxylic acids and their related derivatives that do not fall into more granular classifications, such as dioctyl orthophthalates or terephthalic acid and its salts.

Unlike its sibling categories which specify particular phthalate esters, dinonyl or didecyl orthophthalates, other esters of orthophthalic acid, phthalic anhydride, or terephthalic acid, this residual "Other" category serves as a catch-all. It captures aromatic polycarboxylic acids and their derivatives that are chemically distinct or not covered by the more precisely defined sibling entries.

The subcategories branching from 2917.39 provide further refinement. These include specific compounds like 1,2,4-Benzenetricarboxylic acid, 1,2-dianhydride (Trimellitic anhydride), Phthalic acid, and 4-Sulfo-1,8-naphthalic anhydride, as well as Naphthalic anhydride and Isophthalic acid. These subdivisions allow for more precise classification of a variety of important aromatic polycarboxylic acids and their derivatives, based on their chemical structure and intended applications.