6907.23.20.00 - Having not over 3229 tiles per square meter, most of which have faces bounded entirely by straight lines

This HTS code covers ceramic tiles specifically designed for flags, paving, hearths, or walls that are characterized by a water absorption coefficient by weight exceeding 10 percent. These tiles are also distinguished by their glaze. Crucially, the largest surface area of these glazed tiles must be capable of being enclosed within a square with a side length of less than 7 centimeters.

The primary distinction of this category lies in the combination of a high water absorption rate (over 10%), a glazed finish, and a specific size limitation on the largest surface area. Sibling categories at this level would likely differentiate based on different water absorption coefficients, whether the tiles are glazed or unglazed, or if they do not meet the specified size criteria for the largest surface area.

As a leaf node, this classification does not have further subdivisions. Therefore, it is essential to carefully consider the precise dimensions of the largest surface area of the glazed tile in question. Examples of goods falling under this classification could include small, highly porous decorative wall tiles or specialized mosaic tesserae intended for specific paving or hearth applications, provided they meet all stipulated criteria.