2920.90.51.00 - Other

This HTS category, HTS 2920.90.51.00, specifically covers "Other" esters of inorganic acids of nonmetals, their salts, and their halogenated, sulfonated, nitrated, or nitrosated derivatives, when these are not aromatic in nature. This broad classification encompasses a wide array of compounds that do not fit into more specific subcategories within heading 2920. For instance, it would include aliphatic esters of sulfuric acid, phosphoric acid, silicic acid, or boric acid, as well as their corresponding salts. The defining characteristic is the ester linkage to an inorganic acid derived from a nonmetal, and the absence of aromatic functional groups.

In contrast to its sibling category, which likely deals with aromatic esters of inorganic acids, this classification is strictly for non-aromatic compounds. This distinction is crucial for accurate tariff assignment, as the chemical properties and potential applications of aromatic versus non-aromatic organic compounds often differ significantly, leading to different tariff treatments. The "Other" designation highlights that this node serves as a residual category for compounds meeting the broader heading criteria but lacking a more precise placement.

As a leaf node, HTS 2920.90.51.00 does not have further subcategories. Therefore, classification within this code relies heavily on determining if a substance meets the requirements of esters of other inorganic acids of nonmetals (excluding esters of hydrogen halides) and their salts; their halogenated, sulfonated, nitrated or nitrosated derivatives, and that it is not aromatic. Practical classification would involve detailed chemical analysis to confirm the presence of the ester linkage to an inorganic acid from a nonmetal and the absence of benzene rings or other aromatic structures, alongside the absence of specific halogenated, sulfonated, nitrated, or nitrosated derivatives if such specific subheadings existed.