6815.99.41.10 - Containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch

This HTS classification, 6815.99.41.10, specifically covers articles manufactured from mineral substances that are primarily composed of magnesia (more than 70% by weight, expressed as MgO). These articles are further characterized by a carbon content ranging from trace amounts up to, but not including, 30% by weight. A key defining feature of these goods is their method of bonding, which must be achieved chemically through the use of resin or pitch. These products are typically used in high-temperature applications, such as refractory linings in furnaces, kilns, and other industrial equipment where resistance to heat and chemical attack is crucial.

At this specific sub-level (6815.99.41), the differentiation lies in the precise chemical composition and bonding agents. While sibling categories under 6815.99.41 might cover other "Other" mineral articles with different primary compositions or bonding methods, this particular sub-heading is narrowly defined by the high magnesia content and the specific resin or pitch bonding. This distinction is vital for accurate customs valuation and duty assessment, ensuring that articles meeting these exact technical specifications are correctly identified.

As this is a leaf node in the HTS database, there are no further subcategories. Therefore, the focus remains on the specific criteria outlined in the description: the magnesia content, the defined range of carbon, and the resin or pitch chemical bonding. Importers and exporters must ensure that their documentation clearly reflects these material and manufacturing characteristics to support classification under 6815.99.41.10.