2921.29.00.55 - Other

This category, HTS Code 2921.29.00.55, encompasses acyclic polyamines and their derivatives, as well as their salts, that are not specifically enumerated in preceding subheadings within 2921.29. It serves as a residual category for compounds possessing two or more amine functional groups linked by aliphatic carbon chains, where a more precise classification is not applicable. Examples may include complex polyamines with specific functionalities or structures, or salts formed from such polyamines where the specific amine is not listed.

This "Other" category is distinguished from its sibling HTS codes (2921.29.00.10, 2921.29.00.20, and 2921.29.00.30) which specifically identify tetraethylene pentamine, triethylenetetramine, and diethylenetriamine, respectively. Unlike these defined, more commonly traded polyamines, 2921.29.00.55 is for those acyclic polyamines and their salts that do not match the exact chemical structures of the named siblings. The key differentiator lies in the specific arrangement and number of amine groups and the carbon backbone, where this category captures all remaining valid examples.

As this node is a leaf node within the HTS database, there are no further subcategories to introduce. Classification under this code requires careful examination of the chemical structure and composition of the polyamine or its salt to confirm that it does not fit into any of the more specifically enumerated subheadings within the broader category of acyclic polyamines. This ensures that all qualifying acyclic polyamines and their derivatives, when not otherwise classified, are appropriately captured within this residual HTS code.