3207.40 - Glass frit and other glass, in the form of powder, granules or flakes:

This HTS category, 3207.40, encompasses glass frit and other forms of glass that are specifically processed into powder, granular, or flake form. These materials are integral components in various industrial applications, particularly within the ceramic, enamelling, and glass manufacturing sectors. The key characteristic is the physical form of the glass; it is not in solid, unbroken pieces but rather a collection of fine particles.

Distinguishing 3207.40 from its sibling categories, 3207.10 covers prepared pigments, opacifiers, and colors which are ready for direct use as coloring agents. Category 3207.20 pertains to vitrifiable enamels and glazes, which are designed to fuse to a substrate when fired, and engobes (slips) and similar preparations used for surface coating. Liquid lustres and related items fall under 3207.30. In contrast, 3207.40 focuses on the base glass material in particulate form, which is then often further processed or combined with other substances to create the finished products described in the other subheadings.

The subcategories within 3207.40 further refine the classification based on the processing of the glass frit. Subheading 3207.40.10 is designated for glass frit that has been specifically ground or pulverized. The remaining entries under 3207.40.50, indicated as "Other," will encompass glass frit in powder, granular, or flake form that has not undergone specific grinding or pulverization processes as the primary distinguishing factor, or represents other forms of particulate glass not otherwise specified.