6902.20 - Containing by weight more than 50 percent of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products:

This HTS category, 6902.20, encompasses refractory ceramic constructional goods characterized by a significant mineral composition. Specifically, these products must contain by weight more than 50 percent of either alumina (Al₂O₃), silica (SiO₂), or a combination thereof. These materials are chosen for their ability to withstand high temperatures and harsh chemical environments, making them essential in industrial furnace linings, kilns, and other high-heat applications.

This classification is distinguished from its sibling categories by its primary chemical constituent. Unlike heading 6902.10, which focuses on refractories with a high content of magnesium, calcium, or chromium oxides, this category specifically addresses alumina and silica-rich ceramics. Heading 6902.90 serves as a residual category for refractory ceramic constructional goods that do not meet the specific compositional requirements of 6902.10 or 6902.20.

Within this category, further distinctions are made to refine classification. Subcategory 6902.20.10 is designated for "Bricks," which are typically standardized, load-bearing units. The subcategory 6902.20.50, "Other," covers a broader range of refractory ceramic constructional goods that are not specifically bricks, such as blocks, tiles, or custom-shaped components designed for specialized refractory applications.