9902.10.66 - Poly(isobutylene) hydroformylation products, reaction products with ammonia (CAS No. 337367-30-3) (provided for in subheading 3902.20.50)

This HTS category, 9902.10.66, specifically covers poly(isobutylene) hydroformylation products that have undergone reaction with ammonia. The CAS number 337367-30-3 identifies this precise chemical substance. These products are intended for importation under temporary legislation or trade agreement provisions, as indicated by their placement within Chapter 99, which often addresses special classification circumstances and temporary modifications to tariff rates. The provided description further notes that these goods are "provided for in subheading 3902.20.50," signifying their underlying chemical nature as polymers of isobutylene but their classification here is due to a specific, temporary trade provision.

Distinguishing this entry from its sibling categories, which predominantly cover live animals in Chapter 01, is straightforward. Chapter 99 entries are inherently distinct from the general tariff classifications found in the earlier chapters of the HTS. While siblings in other chapters might cover goods with similar intended uses or materials, entries within Chapter 99 are typically used for specific policy-driven classifications, such as those related to temporary import restrictions, trade agreement benefits, or special statistical tracking.

As this is a leaf node, there are no subcategories to introduce. The classification is highly specific, and further subdivision would typically occur within the primary HTS chapter (3902.20 in this case) that governs the underlying chemical substance. Therefore, the focus for this category lies solely on accurately identifying and documenting the importation of poly(isobutylene) hydroformylation products reacted with ammonia under the specific temporary provisions associated with HTS code 9902.10.66.