6902 - Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths:

This HTS category, 6902, encompasses a specific range of refractory ceramic constructional goods. These are materials designed to withstand high temperatures and are crucial in industrial applications involving heat. The definition explicitly excludes goods derived from siliceous fossil meals or similar siliceous earths, such as diatomite or kieselguhr, which fall under separate classifications. The primary purpose of these items is their inherent resistance to heat and chemical corrosion, making them essential components in furnaces, kilns, incinerators, and other high-temperature environments.

When classifying within Chapter 69, it's important to distinguish 6902 from other ceramic product categories. Unlike general ceramic wares (e.g., tableware, sanitary ware) or insulating ceramics, 6902 focuses solely on robust, refractory construction materials. While siblings within the broader HTS system span a vast array of goods from live animals to machinery, the relevant distinction within Chapter 69 and its parent section lies in the specific technical application and material properties of these refractory articles.

Category 6902 is further subdivided to allow for more precise classification based on the material composition, which directly influences their thermal performance. The subcategories differentiate between refractory ceramics primarily composed of magnesium, calcium, or chromium oxides (6902.10), those predominantly containing alumina or silica (6902.20), and all other types of refractory ceramic constructional goods not meeting these specific compositional criteria (6902.90). This breakdown aids in determining the appropriate tariff and potential trade regulations based on the exact makeup of the refractory product.