2917.39.17.00 - Tetrabromophthalic anhydride

This HTS classification covers Tetrabromophthalic anhydride, a specific aromatic polycarboxylic acid derivative. The key characteristic is the presence of four bromine atoms substituted onto the phthalic anhydride structure, distinguishing it from other phthalic or naphthalic anhydrides and acids listed within the "Other" subheading. This compound serves primarily as a flame retardant additive in various materials, particularly plastics and textiles, due to its high bromine content.

While siblings like 1,2,4-Benzenetricarboxylic acid, 1,2-dianhydride (Trimellitic anhydride), Phthalic acid, and Naphthalic anhydride are also aromatic anhydrides or acids, they lack the specific tetrabromination of this entry. Similarly, 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) and Isophthalic acid are chemically distinct compounds. The defining feature for classification under 2917.39.17.00 is the chemical identity of Tetrabromophthalic anhydride itself.

As this is a leaf node within the HTS, there are no further subdivisions. Classification at this level is based on the precise chemical identity of the product. Importers and exporters should ensure that the goods being declared precisely match the chemical structure and name of Tetrabromophthalic anhydride to avoid misclassification and potential customs issues.