2917.36.00.00 - Terephthalic acid and its salts

This HTS category, 2917.36.00.00, specifically covers terephthalic acid and its salts. Terephthalic acid is an organic compound widely recognized as a precursor in the production of polyethylene terephthalate (PET), a key polymer used in textiles, films, and packaging. Its salts, such as sodium terephthalate, also fall under this classification. The defining characteristic for inclusion is the chemical structure of terephthalic acid, which is a benzene ring substituted with two carboxyl groups in the para position.

Distinguishing this category from its siblings is crucial for accurate classification. For instance, it differs from 2917.32.00.00 and 2917.33.00 which pertain to specific esters of orthophthalic acid, particularly dioctyl and dinonyl or didecyl orthophthalates, respectively. Similarly, 2917.34.01 covers other esters of orthophthalic acid, which are structurally distinct. Phthalic anhydride (2917.35.00.00) is another related compound but represents the anhydride form, whereas this category focuses on the acid and its direct salt forms. Dimethyl terephthalate (2917.37.00.00) is an ester derivative of terephthalic acid and thus classified separately.

As a leaf node within the HTS structure, 2917.36.00.00 does not have further subdivisions. Therefore, classification within this code relies on confirming the chemical identity of the imported or exported substance as either terephthalic acid itself or one of its salts. Practical considerations for classification might include reviewing product specifications, certificates of analysis, or chemical test results to verify the presence and purity of terephthalic acid or its salts, differentiating it from closely related aromatic dicarboxylic acids, their derivatives, or other esters.