2917.39.20.00 - Plasticizers

This classification covers aromatic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids, and their derivatives, which are not specifically enumerated under preceding headings. These substances are characterized by the presence of two or more carboxyl groups attached to an aromatic ring system. Their diverse applications, often as intermediates or additives, necessitate their inclusion within this broad category.

As a subcategory within "Other," this heading encompasses a range of compounds that do not fit into more specific classifications of aromatic polycarboxylic acid derivatives. It serves as a residual category for compounds that share the fundamental aromatic polycarboxylic acid structure but lack distinct defining characteristics or uses that would place them elsewhere.

Given this is a leaf node, specific examples of included substances would typically include compounds like phthalic acid derivatives, trimellitic acid derivatives, or pyromellitic acid derivatives that are not otherwise specified. The primary classification criterion here is the presence of the aromatic polycarboxylic acid functional groups and their associated derivative structures, excluding those explicitly classified under more granular HTS codes.