2529.22.00.00 - Containing by weight more than 97 percent of calcium fluoride

This HTS category, 2529.22.00.00, specifically classifies fluorspar that contains a high concentration of calcium fluoride by weight, exceeding 97 percent. Fluorspar, also known as fluorite, is a mineral composed primarily of calcium fluoride (CaF2). Its industrial applications are diverse, ranging from its use as a fluxing agent in the production of steel and aluminum, to its role in the manufacturing of optical lenses, ceramics, and hydrofluoric acid, a key precursor for many fluorochemicals. The defining characteristic for classification within this heading is the purity level of calcium fluoride.

This classification distinguishes itself from its sibling category, 2529.21.00.00, which covers fluorspar containing 97 percent or less of calcium fluoride by weight. The threshold of 97 percent is the critical determinant for placement within either the higher purity classification (2529.22.00.00) or the lower purity classification. Importers and exporters must accurately ascertain the calcium fluoride content through laboratory analysis to ensure correct tariff placement, which can significantly impact duty rates.

As this is a leaf node, there are no further subcategories under 2529.22.00.00. Therefore, all fluorspar meeting the criteria of containing more than 97 percent calcium fluoride by weight will be classified directly under this heading. The emphasis for practical classification remains on the quantitative analysis of the mineral's composition to confirm its high purity of calcium fluoride.