9902.11.69 - Ion-exchange resin, free base form, utilizing a tertiary amine functional group consisting of 2-​propenamide, N-​[3-​(dimethylamino)​propyl]​-​, polymer with diethenylbenzene and 1,​1'-​[oxybis(2,​1-​ethanediyloxy)​]​bis[ethene] (CAS No. 65899-87-8) 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, 9902.11.69, covers a specific type of ion-exchange resin. This resin is provided in its free base form and utilizes a tertiary amine functional group. Its chemical composition is a polymer of 2-propenamide, N-[3-(dimethylamino)propyl]-, with diethenylbenzene and 1,1'-[oxybis(2,1-ethanediyloxy)]bis[ethene], identified by CAS No. 65899-87-8. The physical form is crucial for classification, specifying spherical beads with a mean particle size ranging from 0.30 to 1.20 mm. This particular item is subject to temporary legislation and is provided for under subheading 3914.00.60, indicating a specific regulatory framework under Section XXII.

As a leaf node within Chapter 99, this category does not have subcategories. Its specificity arises from its inclusion under temporary legislation and modifications, distinguishing it from the general tariff classifications found in other chapters. While other chapters might classify ion-exchange resins based on their material composition (e.g., Chapter 39 for plastics), this heading indicates a unique import status, likely due to trade agreements or specific import restrictions under Section 22 of the Agricultural Adjustment Act. Therefore, classification within 9902.11.69 is contingent on meeting the precise chemical and physical descriptions outlined and the applicability of the temporary measures in place.