2918.19 - Other:

This HTS category, 2918.19, encompasses carboxylic acids possessing an alcohol function, along with their anhydrides, halides, peroxides, and peroxyacids, and their halogenated, sulfonated, nitrated, or nitrosated derivatives, that are *not* specifically classified under preceding headings within 2918.1. Essentially, it acts as a residual category for polyfunctional organic acids where the alcohol group is present in addition to the carboxylic acid function, but the compound does not fall into more specific subheadings like lactic acid (2918.11), tartaric acid (2918.12), or citric acid (2918.14).

The key differentiator for this group is the combination of a carboxylic acid group and a hydroxyl (alcohol) group within the same molecule, excluding those explicitly listed as siblings. For instance, while lactic acid is a hydroxy acid, it is detailed in its own subheading. Similarly, tartaric and citric acids, along with their salts and esters, are assigned to distinct headings. Therefore, 2918.19 serves to capture other organic acids that meet the general criteria of having both functional groups but do not fit the more narrowly defined prior classifications.

Within this category, further distinctions are made to account for aromatic versus non-aromatic (aliphatic) structures. The subcategories "Aromatic" and "Other" are used to group these compounds based on the presence or absence of an aromatic ring system within their molecular structure. This allows for a more granular classification of these polyfunctional carboxylic acids, facilitating precise tariff application.