9902.08.96 - Fritted barium borosilicate glass with a mean particle size between 0.4 and 10 microns, Young's modulus of 71GPa, a density of 2.8 grams per cubic centimeter, radiopacity of 4.2, a refractive index of 1.53, and chemical composition of 55 percent silicon dioxide, 25 percent barium oxide, 10 percent boron trioxide and 10 percent aluminum oxide by weight (provided for in subheading 3207.40.10)

This HTS code, 9902.08.96, pertains to a highly specific type of fritted barium borosilicate glass. The defining characteristics of this material include a mean particle size ranging from 0.4 to 10 microns, a Young's modulus of 71 GPa, a density of 2.8 g/cm³, radiopacity of 4.2, and a refractive index of 1.53. Its precise chemical composition is also critical for classification, with the glass consisting of 55% silicon dioxide, 25% barium oxide, 10% boron trioxide, and 10% aluminum oxide by weight. This particular formulation is intended for use as a component within the broader category of ceramic enamels and glazes, as indicated by its provision for under subheading 3207.40.10.

As a sub-division within Chapter 99, which covers temporary legislation and special trade provisions, this HTS code represents a specific item subject to unique tariff or trade treatment. Its specificity in terms of physical properties and chemical composition distinguishes it from more general classifications of glass or glass powders. The detailed technical specifications provided in the description are paramount for accurate classification, ensuring that only materials meeting these exact criteria are categorized here, thereby differentiating it from other glass products that may have different applications or manufacturing processes.

Given that this is a leaf node within the HTS structure, there are no further subcategories to explore. Therefore, the focus for classification under 9902.08.96 is on the precise adherence to the enumerated physical and chemical properties. Importers and exporters must meticulously verify that the fritted barium borosilicate glass meets all stated parameters, including particle size, mechanical, optical, and elemental composition, to ensure correct duty assessment and compliance with any associated trade regulations.