9902.10.37 - Magnesium aluminum hydroxide carbonate (synthetic hydrotalcite) (CAS No. 11097-59-9) (provided for in subheading 2842.90.90); and magnesium aluminum hydroxide carbonate (synthetic hydrotalcite) (CAS No. 11097-59-9) coated with stearic acid (CAS No. 57-11-4) (provided for in subheading 3812.39.90)

This HTS category, 9902.10.37, is dedicated to specific temporary modifications and provisions related to magnesium aluminum hydroxide carbonate, commonly known as synthetic hydrotalcite. It encompasses two distinct forms: the pure synthetic hydrotalcite itself, identified by CAS No. 11097-59-9, which is primarily provided for under subheading 2842.90.90; and synthetic hydrotalcite that has been coated with stearic acid (CAS No. 57-11-4), which falls under subheading 3812.39.90. These entries are part of Chapter 99, indicating temporary legislation or modifications that may be subject to change based on trade agreements or specific import restrictions.

Distinguishing this category from its sibling entries, which generally cover live animals under Chapter 01, is crucial. HTS 9902.10.37 deals exclusively with specific chemical compounds and their modified forms, not living organisms. The focus here is on the chemical composition and intended application of synthetic hydrotalcite, particularly in its pure and stearic acid-coated variations, under special tariff provisions. Unlike the broad categories of live animals, this HTS code is highly specific, addressing particular materials subject to unique trade regulations.

As a leaf node within the HTS structure, HTS 9902.10.37 does not have further subcategories. Therefore, classification under this heading relies entirely on the precise identification of the imported good as either pure synthetic hydrotalcite (CAS No. 11097-59-9) or synthetic hydrotalcite coated with stearic acid (CAS No. 57-11-4). Importers must ensure accurate documentation to support the classification, referencing the respective base HTS subheadings mentioned within the description, to comply with the temporary measures and restrictions outlined in Section XXII and Chapter 99.