9902.11.27 - 1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol, decanedioic acid and hexanedioic acid (CAS No.109586-86-9) (provided for in subheading 3907.99.50)

This HTS category, 9902.11.27, specifically covers a particular type of polymer: a polyester formed from the reaction of 1,4-benzenedicarboxylic acid with 1,4-butanediol, decanedioic acid, and hexanedioic acid. This chemical structure and its specific composition are key to its identification. This provision is a temporary classification, indicated by its placement within Chapter 99, which is reserved for temporary legislation and modifications.

Chapter 99 categories are distinct from the primary commodity chapters (like Chapters 1-97) which classify goods based on their inherent nature, material, or primary function. While the base polymer itself might fall under a standard HTS chapter (such as Chapter 39 for plastics, as indicated by the parenthetical reference to subheading 3907.99.50), this Chapter 99 code signifies a special import status, often related to trade agreements, temporary restrictions, or specific policy initiatives. Therefore, its "siblings" are other temporary legislative provisions within Chapter 99, not other types of polymers found in Chapter 39.

As a leaf node in the HTS database, this specific code does not have further subdivisions. Classification under 9902.11.27 is final at this level, meaning that once goods meet the definition and context for this provision, they are classified directly here. The focus for classification professionals will be on verifying that the imported product precisely matches the chemical description and that the conditions triggering this special provision are met.