9902.10.52 - Mixtures of polymers based on tall oil fatty acids, phthalic anhydride, glycerin and rosin (CAS No. 68015-39-4); poly(isobutyl vinyl ether) (CAS No. 9003-44-5); zinc 2-ethylhexanoate (CAS No. 136-53-8); and more than 50 percent by weight of a hydrocarbon-based solvent (provided for in subheading 3208.10.00)

This HTS code, 9902.10.52, falls under Chapter 99 of the Harmonized Tariff Schedule, which pertains to temporary legislation, temporary modifications, and additional import restrictions. Specifically, this entry covers certain mixtures or preparations containing specific polymers, zinc 2-ethylhexanoate, and a significant proportion of hydrocarbon-based solvents. The key components defining this classification are mixtures based on tall oil fatty acids, phthalic anhydride, glycerin, and rosin; poly(isobutyl vinyl ether); zinc 2-ethylhexanoate; and more than 50% by weight of a hydrocarbon-based solvent that would otherwise be classified under subheading 3208.10.00.

Unlike the primary HTS headings which classify goods by their inherent nature and use (e.g., live animals in Chapter 01), this Chapter 99 provision imposes specific, often temporary, restrictions or modified tariff treatments on particular goods. Therefore, the "sibling" categories at this level would also be within Chapter 99, representing other distinct temporary modifications or import restrictions. The significance of this classification lies not in the inherent nature of the listed components but in their combination and the fact that they are subject to specific trade agreement legislation or Section 22 of the Agricultural Adjustment Act, as amended.

As this is a leaf node within the HTS database, there are no further subcategories branching from 9902.10.52. This means that any import or export activity involving the precisely defined mixtures described here will be directly classified under this specific code. The detailed listing of components and the percentage requirement for the solvent are critical for accurate classification, ensuring that only the specified preparations are subject to the temporary measures outlined in this provision.