2918.21 - Salicylic acid and its salts:

This HTS category, 2918.21, encompasses salicylic acid and its salts. Salicylic acid, an organic compound known for its medicinal properties, is characterized by a carboxylic acid group and a hydroxyl group attached to a benzene ring. Its salts, formed by the reaction of salicylic acid with bases, are also included within this classification. These substances are typically found in powder or crystalline form and are widely used in pharmaceuticals, cosmetics, and as chemical intermediates.

Distinguishing this category from its siblings, 2918.22 covers O-acetylsalicylic acid (aspirin) and its derivatives, which have a distinct chemical modification. Category 2918.23 specifically addresses other esters and salts derived from salicylic acid where the primary focus is on the ester linkage or alternative salt forms not directly covered under the general salicylic acid salts. Category 2918.29 acts as a residual category for any other derivatives of salicylic acid that do not fall into the more specific preceding subheadings.

Under HTS 2918.21, two primary subcategories exist to further refine the classification. The first, 2918.21.10.00, is designated for salicylic acid and its salts specifically identified as "Suitable for medicinal use." This distinction is crucial for regulatory and duty purposes, recognizing the therapeutic applications of these compounds. The second subcategory, 2918.21.50.00, covers all "Other" salicylic acid and its salts, encompassing those not intended for medicinal applications, such as those used in industrial processes or as raw materials for non-pharmaceutical products.