2915.90.18.10 - Perfluorooctanoic acids and their salts

This HTS category, 2915.90.18.10, specifically classifies perfluorooctanoic acids (PFOA) and their salts. These are a group of synthetic fluorinated chemicals characterized by a chain of eight carbon atoms with all hydrogen atoms replaced by fluorine, and a carboxyl group. Their unique properties, such as thermal stability and resistance to water and oil, have led to their use in various industrial applications.

Within the broader heading of "Other" saturated acyclic monocarboxylic acids and their derivatives, this subcategory differentiates based on the specific chemical structure of perfluorooctanoic acids. The sibling category, 2915.90.18.90, covers all other miscellaneous saturated acyclic monocarboxylic acids and their derivatives not otherwise specified. Therefore, the key distinction lies in the complete fluorination of the octanoic acid chain and the classification of PFOA and its salts as distinct chemical entities.

As a leaf node, this category does not have further subcategories. Classification under 2915.90.18.10 is definitive for perfluorooctanoic acids and their corresponding salt forms, based on their chemical identity and the scope defined by the parent headings within Chapter 29.