2904.32.00.00 - Ammonium perfluorooctane sulfonate

This HTS category, 2904.32.00.00, specifically covers **Ammonium perfluorooctane sulfonate**. This is a specific salt derived from perfluorooctane sulfonic acid, where the cation is ammonium. It falls within the broader classification of sulfonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated, and more narrowly, under perfluorooctane sulfonic acid, its salts, and perfluorooctane sulfonyl fluoride.

The distinction of this category lies in the cation. While siblings like 2904.31.00.00 represent the parent acid itself, and 2904.33.00.00, 2904.34.00.00, and 2904.35.00.00 cover lithium, potassium, and other salts respectively, this code is exclusively for the ammonium salt. Similarly, 2904.36.00.00 covers the sulfonyl fluoride derivative, a distinct chemical compound. The classification hinges on the precise chemical identity of the salt.

As this is a leaf node in the HTS structure, there are no further subcategories under 2904.32.00.00. Therefore, the focus for classification purposes is on ensuring the product is indeed ammonium perfluorooctane sulfonate, based on its chemical composition and properties, to differentiate it from other perfluorooctane sulfonate salts and derivatives.