9902.10.21 - Preparations containing 12-hydroxy-9-octadecenoic acid (Ricinoleic acid) of a kind used as a diluent in lubricants (CAS No. 141-22-0) (provided for in subheading 3811.21.00)

This HTS code, 9902.10.21, designates specific preparations containing 12-hydroxy-9-octadecenoic acid, commonly known as Ricinoleic acid. These preparations are specifically identified by their intended use as a diluent in lubricants and are further defined by their Chemical Abstracts Service (CAS) Registry Number, 141-22-0. The inclusion of this CAS number provides a definitive identifier, ensuring accurate classification of this particular chemical compound and its intended application.

Given that this is a leaf node within Chapter 99, there are no further subcategories to explore. The distinction for this entry lies in its placement within Chapter 99, which encompasses temporary legislation and special classification provisions. Unlike the primary chapters of the HTS that classify goods based on their inherent nature (e.g., agricultural products in Chapter 1, or chemicals in Chapter 38), this code represents a temporary modification or a specific, often temporary, import restriction or provision. Therefore, its "siblings" would be other temporary or special classification codes within Chapter 99, rather than goods classified by their fundamental economic or material characteristics found in other chapters. The parenthetical reference to subheading 3811.21.00 indicates the underlying classification of the good before the temporary provision is applied, highlighting that while it is being treated under a special provision, its fundamental nature relates to lubricating preparations.