9902.11.76 - Ion-exchange resin and chelating resin, with a isothiouronium functional group, iminodiacetic acid ion-exchange resin (CAS No. 109945-55-3) 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, 9902.11.76, specifically covers ion-exchange and chelating resins characterized by the presence of a isothiouronium functional group. The description further narrows the scope to iminodiacetic acid ion-exchange resin (CAS No. 109945-55-3) in a spherical bead form with a precise mean particle size range between 0.30 and 1.20 mm. Importantly, these resins are classified under this special provision because they are also provided for in subheading 3914.00.60 of the Harmonized Tariff Schedule.

The context of Chapter 99 indicates that this classification falls under temporary legislation or modifications, often related to trade agreements or specific import restrictions proclaimed under Section 22 of the Agricultural Adjustment Act. Unlike the broader categories found in earlier chapters (such as Chapter 01 for live animals), which deal with basic agricultural commodities, this provision addresses highly specialized chemical materials with specific functional properties and physical characteristics.

As this is a leaf node, there are no further subdivisions within this specific HTS code. The classification is intended to capture a very particular type of resin that meets all the stated criteria, including its chemical composition, form, particle size, and its underlying classification within the general polymer chapter (3914.00.60). This level of detail is crucial for accurate customs declarations and ensuring compliance with any applicable temporary trade measures.