6902.20.10.20 - Other

This HTS classification, 6902.20.10.20, pertains to refractory bricks that are not primarily composed of alumina but rather a mixture or compound of alumina and silica, or predominantly silica. These bricks are designed to withstand high temperatures and are utilized in the construction of furnaces, kilns, incinerators, and other high-temperature industrial applications. Their composition is critical, distinguishing them from bricks where alumina is the primary constituent by weight.

The distinguishing factor for this category lies in its chemical composition, specifically the presence of more than 50% by weight of silica (SiO2) or a combination of alumina and silica. This differentiates it from the sibling category 6902.20.10.10, which exclusively covers refractory bricks containing over 50% alumina by weight. Therefore, when classifying, it is essential to analyze the material's percentage breakdown of alumina and silica to determine the correct sub-classification.

As this is a leaf node, there are no further subdivisions. Classification within this code hinges on the accurate determination that the refractory brick contains more than 50% silica, or a mixture of alumina and silica, and does not exclusively meet the criteria for being predominantly alumina-based. Examples include silica bricks used in glass furnaces and high-alumina-silica bricks for general refractory purposes where neither component individually exceeds 50% by weight, but their combined presence does.