9902.01.70 - Mixtures or coprecipitates of yttrium phosphate (CAS No. 13990-54-0) and cerium phosphate (CAS No. 13454-71-2) (provided for in subheadings 2846.10.00 and 2846.90.80)

This HTS category, 9902.01.70, specifically covers mixtures or coprecipitates of yttrium phosphate (CAS No. 13990-54-0) and cerium phosphate (CAS No. 13454-71-2). These are specialized inorganic chemical compounds, often used in advanced materials, catalysts, or phosphors. The classification explicitly references their underlying component classifications within Chapters 28, namely subheadings 2846.10.00 and 2846.90.80, indicating these are modified or specially designated forms of those elemental phosphates.

Given the broad scope of Chapter 99, which pertains to temporary legislation and modifications, this particular subheading serves as a very specific provision for these chemical mixtures. Unlike sibling categories that might cover live animals or a vast array of other goods under the general HTS structure, this entry is narrowly defined by its precise chemical composition and designation. Its inclusion in Chapter 99 suggests a potential temporary duty rate, quota, or other trade-related measure applied to these yttrium and cerium phosphate mixtures.

As this is a leaf node in the HTS structure, there are no further subcategories branching from 9902.01.70. The classification is final at this level, meaning the goods meeting the description of yttrium phosphate and cerium phosphate mixtures or coprecipitates are definitively classified here. Importers and exporters should ensure that the material being declared precisely matches the chemical identity and form described to avoid misclassification and potential customs issues.