2921.22.05.00 - Hexamethylenediamine adipate (Nylon salt)

This HTS category specifically addresses hexamethylenediamine and its salts. Hexamethylenediamine is an organic compound characterized by two primary amine groups separated by a six-carbon chain. Its salts are formed by the reaction of hexamethylenediamine with acids. The most prominent example and the primary focus of this classification is hexamethylenediamine adipate, commonly known as Nylon salt, which serves as a crucial precursor in the production of Nylon 6,6.

Distinguishing this category from its siblings involves understanding the specific chemical structure and function. While other categories within "Acyclic polyamines and their derivatives; salts thereof" might cover different polyamines or broader ranges of amine derivatives, this node is strictly limited to hexamethylenediamine and its direct salt forms. The presence of the specific six-carbon chain separating the two amine groups is the defining characteristic.

As this is a leaf node, there are no further subcategories. Classification under HTS code 2921.22.05.00 is definitive for hexamethylenediamine and its salts, particularly when intended for use in the synthesis of polymers like nylon. The physical form and purity of the substance are typically key considerations for customs authorities to ensure accurate classification.