2839 - Silicates; commercial alkali metal silicates:

This HTS category, 2839, encompasses a range of chemical compounds specifically identified as silicates. The primary focus within this heading is on commercial alkali metal silicates, which are salts formed from silicic acid and an alkali metal such as sodium or potassium. These compounds are widely used in industrial applications, including detergents, adhesives, and as binders in various manufacturing processes. The "commercial" designation implies that these are generally manufactured products rather than naturally occurring minerals.

Distinguishing this category from its siblings at the HTS database root level is crucial for accurate classification. Unlike the live animals found in Chapters 1-5, or other general chemical categories, 2839 is highly specific to inorganic silicate compounds of alkali metals. Its placement within Section VI and Chapter 28 underscores its identity as a fundamental inorganic chemical product, distinct from organic compounds, precious metals, or radioactive elements.

The subcategories under 2839 serve to further refine the classification based on the specific alkali metal involved. The most prominent subdivision, "Of sodium," covers sodium silicates, which are the most commonly encountered form of commercial alkali metal silicates. The "Other" category allows for the classification of alkali metal silicates not made with sodium, such as potassium silicates, ensuring comprehensive coverage of this chemical group.