9902.11.23 - Polymer of 1,4-benzenedicarboxylic acid with 1,4-butanediol and hexanedioic acid (CAS No. 60961-73-1) (provided for in subheading 3907.99.50)

This HTS category, 9902.11.23, provides a temporary classification for a specific polymer. This polymer is identified by its chemical composition, being a copolymer of 1,4-benzenedicarboxylic acid with both 1,4-butanediol and hexanedioic acid, and is associated with CAS number 60961-73-1. The inclusion of this specific HTS code indicates a temporary measure related to trade agreements or specific import restrictions, as defined by Chapter 99 of the Harmonized Tariff Schedule. It is crucial to note that this classification is provided *for* subheading 3907.99.50, meaning its primary classification under the permanent HTS structure would likely fall within the broader category of other polyesters.

As this is a leaf node, there are no further subcategories to subdivide this specific classification. Therefore, the focus for practical classification remains on accurately identifying the substance as the described polymer. The distinction from sibling categories, which are primarily animal-based agricultural products, is clear due to the fundamental difference in material composition and origin. This category specifically addresses a synthetic polymer and does not encompass live animals or their immediate products. Classification hinges on verifying the chemical identity of the imported material against the description provided.