2921.51.50.00 - Other 🖩

This HTS category, 2921.51.50.00, encompasses "Other" aromatic polyamines and their derivatives, and salts thereof, specifically falling within the subcategory of o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof. It serves as a residual classification for compounds that fit the broader definition of aromatic diamines and their derivatives but are not specifically enumerated in preceding subheadings. The primary classification criterion is the presence of two or more amino groups (-NH2) attached to one or more aromatic rings, or derivatives thereof where these amino groups have undergone further chemical modification.

This category is distinguished from its sibling, 2921.51.30.00, by the absence of the specific characteristic described in additional U.S. note 3 to section VI. While both fall under the umbrella of o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives, 2921.51.30.00 is reserved for products meeting that particular note's criteria, leaving 2921.51.50.00 for all other compounds within this family. Therefore, classification into this heading requires a thorough review of the chemical structure and a determination that the goods do not meet the specific conditions of other more narrowly defined subheadings.

As a leaf node, 2921.51.50.00 does not have further subcategories for subdivision. Classification within this heading relies on the general principles of the Harmonized Tariff Schedule, focusing on the chemical identity of the compound. Examples of products that might fall here include complex aromatic diamine derivatives or salts of these compounds that do not possess unique characteristics warranting separate classification elsewhere. The classification hinges on the compound's inclusion in the chemical family defined by o-, m-, p-phenylenediamine and diaminotoluenes and their derivatives, while not fitting into any more specific HTS subheading.