9902.10.40 - Mixture of precipitated silica gel (CAS No. 112926-00-8) and (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyl)oxidanyl (CAS No. 2226-96-2) of a kind used as polymerization inhibitors (provided for in subheading 3815.90.50)

This HTS classification, specifically 9902.10.40, pertains to a specialized chemical mixture. It is defined as a combination of precipitated silica gel (CAS No. 112926-00-8) and (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyl)oxidanyl (CAS No. 2226-96-2). The primary functional characteristic of this mixture, as indicated by its description, is its utility as a polymerization inhibitor. This specific application is key to its classification under this provision.

This category is distinct from the numerous other sibling categories under Chapter 99, which generally cover various temporary legislative actions, trade agreement modifications, or specific import restrictions. Unlike the broad scope of other HTS chapters dealing with raw materials, manufactured goods, or live animals (exemplified by siblings such as "Live horses, asses, mules and hinnies" or "Live bovine animals"), HTS 9902.10.40 is highly specific, focusing on a chemical product with a defined industrial purpose. Its placement within Section XXII and Chapter 99 signifies its status as a temporary or specially legislated item, rather than a standard commodity classification.

As a leaf node within the HTS database, HTS 9902.10.40 does not have further subdivisions. Therefore, the classification of goods under this code hinges directly on meeting the exact description provided, which emphasizes the presence of both identified chemical components and their intended use as polymerization inhibitors, as further referenced by the underlying classification subheading 3815.90.50. Any variations in composition or intended use would necessitate a review of alternative HTS classifications.