6903.90.00.10 - Of clay

This HTS classification, 6903.90.00.10, specifically covers "Other" refractory ceramic goods that are primarily made "Of clay." This category encompasses a broad range of specialized ceramic articles designed to withstand high temperatures and harsh chemical environments, beyond those explicitly listed in preceding subheadings of heading 6903. The defining characteristic for this particular subheading is the material composition – clay as the primary constituent of these refractory products.

Distinguishing this subheading from its sibling, 6903.90.00.50 ("Other"), is crucial. While both fall under the "Other refractory ceramic goods" umbrella and are not explicitly defined by specific product types, the differentiator here is the specific material mentioned in the description. Therefore, 6903.90.00.10 is intended for refractory ceramic goods manufactured predominantly from clay, whereas 6903.90.00.50 would likely cover other refractory ceramic goods not of clay or not falling into the more specific categories of heading 6903.

As this is a leaf node, there are no further subcategories to introduce. Classification within this subheading relies heavily on a thorough understanding of the product's composition, specifically its clay-based nature, and its intended refractory use, ensuring it is not otherwise specified within the more granular classifications of heading 6903 or other relevant chapters of the HTS.