9902.11.70 - Ion-exchange resin, chloride form, utilizing a quarternary ammonium functional group, consisting of 1,2-bis(ethenyl)benzene; 4-[(E)-2-[(E)-2-but-3-enoxyethenoxy]ethenoxy]but-1-ene; trimethyl-[3-(prop-2-enoylamino)propyl]azanium; chloride (CAS No. 65997-24-2) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60)

This HTS classification pertains to specific ion-exchange resins designated in their chloride form. These resins are characterized by the presence of a quarternary ammonium functional group and are composed of 1,2-bis(ethenyl)benzene; 4-[(E)-2-[(E)-2-but-3-enoxyethenoxy]ethenoxy]but-1-ene; trimethyl-[3-(prop-2-enoylamino)propyl]azanium; chloride. A key physical characteristic is their form as spherical beads with a mean particle size ranging from 0.30 to 1.20 mm. These resins are provided for in subheading 3914.00.60, indicating they are a specialized type of ion-exchange resin falling under the broader category of ion-exchangers based on polymers of Chapter 39.

As a highly specific classification within Chapter 99, this entry is distinct from the general trade goods found in the initial chapters of the HTS, such as live animals (Chapters 01). Its placement in Chapter 99 signifies that it falls under temporary legislation or special provisions, likely related to temporary modifications proclaimed pursuant to trade agreements or specific import restrictions. Therefore, its coverage is narrowly defined and subject to the particular conditions outlined in the Chapter 99 framework, rather than being a standard commodity classification.

Since this is a leaf node, there are no further subcategories under this specific HTS code. Classification at this level is definitive, meaning that goods meeting the precise description and physical characteristics outlined are classified here. The defining criteria are the chemical composition, the functional group, the physical form (spherical beads), and the particle size range. Any variation in these attributes would necessitate re-evaluation against other potentially applicable HTS classifications, particularly within Chapter 39 or other relevant sections of the tariff.