2917.19.70 - Other

This category, 2917.19.70, encompasses acyclic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids, and their derivatives that are not otherwise specified. It functions as a residual category for compounds within the acyclic polycarboxylic acid family that do not fit into more specific subheadings. These substances are characterized by the presence of two or more carboxyl groups (-COOH) or their functional equivalents (like anhydrides, -CO-O-CO-, or halides, -CO-X) attached to an open-chain carbon structure.

This subheading specifically excludes compounds derived in whole or in part from aromatic hydrocarbons, which are classified under 2917.19.40. The distinction lies in the fundamental structure of the carbon skeleton. While both deal with polycarboxylic acids, this entry focuses solely on acyclic (non-ring) structures, whereas the sibling category broadens the scope to include derivatives that originate from aromatic hydrocarbon precursors.

Within this classification, further distinctions are made to provide more granular control. The subcategories 2917.19.70.20 and 2917.19.70.50 separate plasticizers from other remaining "other" acyclic polycarboxylic acid derivatives. Plasticizers are additives that increase the plasticity or fluidity of a material, typically plastics. The "other" subcategory then captures any remaining acyclic polycarboxylic acid derivatives not otherwise specified or categorized as plasticizers.