9902.11.56 - Poly(divinylbenzene-co-ethylstyrene) (CAS No. 9043-77-0) (provided for in subheading 3911.90.90)

This HTS category, 9902.11.56, specifically covers Poly(divinylbenzene-co-ethylstyrene), identified by CAS No. 9043-77-0. This classification falls under Chapter 99, which pertains to temporary legislation, temporary modifications to trade agreements, and additional import restrictions. The "provided for in subheading 3911.90.90" notation indicates that while this polymer is subject to the specific provisions of Chapter 99, its underlying nature aligns with other chemically modified polymers or copolymers under heading 3911.

Unlike the primary HTS chapters that classify goods based on their inherent material composition and function (such as Chapter 39 for Plastics and articles thereof), Chapter 99 categories represent specific, often temporary, regulatory actions. Therefore, 9902.11.56 does not have direct siblings in the traditional sense of being alternative classifications for the same base product. Its existence here is due to unique import regulations or restrictions applied to this particular polymer, which are distinct from the general classification of polymers under other chapters.

As this is a leaf node, there are no subcategories. The classification is precise and refers to a singular material. The primary function of this HTS code is to identify Poly(divinylbenzene-co-ethylstyrene) for the purpose of applying specific temporary legislative measures, trade agreement modifications, or Section 22 restrictions. Importers must refer to the specific trade agreements and legislation referenced by Chapter 99 to understand the full scope and implications of importing goods under this code.