9902.11.66 - Ion-exchange resin comprised of divinylbenzene co-polymerized with styrene and ethylstyrene (CAS No. 9052-95-3) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60)

This HTS category, 9902.11.66, specifically covers a particular type of ion-exchange resin. The resin is characterized by its composition, being a divinylbenzene co-polymerized with styrene and ethylstyrene. Crucially, its physical form as spherical beads with a defined mean particle size ranging from 0.30 to 1.20 mm is a key identifier. This precise definition ensures that only this specific resin, meeting all these criteria, falls under this classification.

As this entry resides within Chapter 99, it signifies a temporary legislation or modification. Therefore, its direct comparison to sibling categories within Chapter 99 would focus on the specific temporary provisions, trade agreement adjustments, or Section 22 restrictions each code represents. For instance, other codes within Chapter 99 might relate to different temporary duty rates or quotas on various goods, rather than the specific technical specifications of an ion-exchange resin.

Since HTS code 9902.11.66 is a leaf node, there are no further subcategories under it. Classification of goods under this code is final and directly determined by meeting the exact description provided. Any ion-exchange resin with a different chemical composition, particle size, or form, even if it serves a similar function, would likely be classified under a different HTS code, potentially within Chapter 39 for plastics and articles thereof, as indicated by the parenthetical reference to subheading 3914.00.60.