2915.50.50.00 - Other

This HTS classification, 2915.50.50.00, encompasses "Other" propionic acid, its salts, and esters that are not specifically classified elsewhere within the 2915.50 subheadings. This category is intended for those derivatives of propionic acid that do not fall under the "Aromatic" classification. It serves as a residual category for propionic acid derivatives and their related compounds that possess the core structure of propionic acid but lack the specific defining characteristics of other subheadings.

The distinction between this category and its sibling, 2915.50.20.00, lies in their structural characteristics. While 2915.50.20.00 is reserved for aromatic derivatives, this category is for propionic acid derivatives that are not aromatic. This typically includes aliphatic or alicyclic structures. Therefore, the presence or absence of an aromatic ring system directly attached to or part of the propionic acid derivative is a key differentiating factor.

As this is a leaf node in the HTS classification, there are no further subcategories to introduce. Classification within 2915.50.50.00 relies on determining that a product is a salt, ester, or other derivative of propionic acid, and that it does not meet the specific criteria for other more narrowly defined subheadings, particularly the aromatic classification. Examples could include various aliphatic esters or metal salts of propionic acid used in industrial applications or as chemical intermediates.