9902.10.59 - Amorphous synthetic silica gel, silanized (CAS No. 112926-00-8) (provided for in subheading 3824.99.92)

This HTS category, 9902.10.59, specifically covers amorphous synthetic silica gel that has undergone a silanization process, identified by CAS No. 112926-00-8. These materials are provided for in subheading 3824.99.92, indicating they are considered "prepared chemical products" or "chemical products and preparations of the chemical or allied industries." The silanization process imbues the silica gel with specific chemical properties, often enhancing its inertness, hydrophobicity, or surface reactivity for specialized applications.

Distinguishing this category from its numerous siblings at the HTS root level (e.g., live animals, agricultural products) is straightforward. Category 9902.10.59 falls under Section XXII, which deals with temporary legislation and special provisions, rather than the primary chapters (Chapters 1-97) that classify goods based on their inherent nature and composition. The "99" chapters are reserved for specific temporary measures and are distinct from the general commodity classifications found elsewhere in the HTS.

As a leaf node, HTS category 9902.10.59 does not have further subcategories. Therefore, classification within this code is definitive for the specified product. Importers and exporters should ensure that the amorphous synthetic silica gel in question has indeed been silanized and matches the CAS number provided to correctly utilize this provision. The context within Chapter 99 signifies that this classification is subject to the particular trade agreements or legislative actions under which it was established.