6907.23 - Of a water absorption coefficient by weight exceeding 10 percent:

This HTS category, 6907.23, encompasses ceramic flags, paving, hearth, and wall tiles that exhibit a relatively high degree of porosity. Specifically, these articles are defined by a water absorption coefficient by weight exceeding 10 percent. This characteristic indicates that the ceramic material is capable of absorbing a significant amount of water, suggesting a less vitrified and potentially more porous structure compared to other ceramic tiling products.

The key differentiator for this sub-heading lies in its water absorption threshold. It stands apart from its siblings, 6907.21 and 6907.22, which cover ceramics with significantly lower water absorption capacities. While 6907.21 includes tiles with a water absorption coefficient not exceeding 0.5 percent, and 6907.22 covers those between 0.5 percent and 10 percent, this category exclusively includes products absorbing more than 10 percent. This distinction is crucial for customs purposes, reflecting differences in manufacturing processes, material composition, and potential end-use applications.

Within this category, further classification is provided by subheadings that differentiate based on the surface treatment. The primary subdivisions are for "Unglazed" articles (6907.23.10) and "Glazed" articles. This distinction is vital for understanding the final finish and intended use, as glazing can significantly alter the surface properties, durability, and aesthetic qualities of the ceramic tile.