2842.10.00.00 - Double or complex silicates, including aluminosilicates whether or not chemically defined

This HTS category, 2842.10.00.00, specifically covers double or complex silicates, which includes aluminosilicates. These substances are defined by the presence of two or more different metallic or metalloid cations in their silicate structure, or a combination of silicate and other anionic groups. This classification encompasses both chemically defined compounds and mixtures, provided their primary characteristic is that of a double or complex silicate. Examples include materials like sodalite, ultramarine, and certain synthetic zeolites which function as molecular sieves or catalysts.

Distinguishing this category from its sibling, 2842.90.00.00 (Other), is crucial. While 2842.90.00.00 captures "other" salts of inorganic acids or peroxoacids that are not double or complex silicates, 2842.10.00.00 is exclusively for those with the defined double or complex silicate structure. This means that simple silicates (e.g., sodium silicate) or inorganic salts that do not contain a silicate moiety would fall under the "other" category. The defining characteristic for this specific sub-heading is the presence of multiple cations within a silicate framework.

As 2842.10.00.00 is a leaf node, there are no further subcategories to introduce. Classification at this level requires careful analysis of the chemical composition to confirm the presence of a double or complex silicate structure, distinguishing it from simpler silicate compounds or other inorganic salts within the broader scope of Chapter 28.