9902.11.26 - 1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol, hexanedioic acid and nonanedioic acid (CAS No. 83064-08-8) (provided for in subheading 3907.99.50)

This HTS category, 9902.11.26, specifically covers a polyester resin identified by CAS No. 83064-08-8. This material is a polymer formed from the reaction of 1,4-benzenedicarboxylic acid with 1,4-butanediol, hexanedioic acid, and nonanedioic acid. Its classification within Chapter 99 signifies it is subject to temporary legislation or modifications, as indicated by its parenthetical reference to subheading 3907.99.50, which typically covers other polyesters in primary forms.

Distinguishing this specific classification from its sibling categories within the broader HTS structure is crucial. Unlike the live animals enumerated in Chapters 01 through 05, or other broad categories of manufactured goods found in later chapters, this entry pertains to a highly specific chemical compound with a designated polymer structure. Its presence within Chapter 99 highlights that its import status or conditions are governed by special provisions rather than general commodity classifications, often due to trade agreements or specific legislative measures.

As this is a leaf node, there are no further subcategories. Therefore, the focus remains on the precise identification of the described polymer. Importers and exporters should verify that the material in question precisely matches the chemical description and CAS number provided to ensure correct classification under this temporary provision. This specialized classification underscores the need for detailed product knowledge and an understanding of its unique regulatory context.