6907.22 - Of water absorption coefficient by weight exceeding 0.5 percent but not exceeding 10 percent:

This HTS subheading, 6907.22, encompasses ceramic flags, paving, hearth, and wall tiles that are not classified under subheadings 6907.30 or 6907.40, and importantly, exhibit a specific water absorption characteristic. These ceramic products are defined by a water absorption coefficient by weight that is greater than 0.5 percent but does not exceed 10 percent. This range suggests materials with moderate porosity, suitable for various architectural and decorative applications where a balance between durability and some degree of water permeability is acceptable.

To properly classify under 6907.22, it is crucial to differentiate from its sibling categories. Subheading 6907.21 covers ceramic tiles with a very low water absorption (not exceeding 0.5 percent), typically indicating denser, less porous materials often used in high-traffic or wet environments requiring maximum water resistance. Conversely, subheading 6907.23 includes ceramic tiles with higher porosity (exceeding 10 percent water absorption), which may be more susceptible to staining or damage from moisture. Therefore, the defining factor for 6907.22 is this intermediate level of water absorption.

Within this category, further distinctions are made based on surface treatment. Subheading 6907.22.10 specifically addresses unglazed tiles, meaning the ceramic body is exposed without a glassy coating. The subsequent subdivision, simply indicated as "Glazed:", will cover ceramic tiles within the same water absorption range (0.5% to 10%) that have been finished with a vitreous or glassy coating. This distinction is important for end-use, aesthetics, and performance characteristics like stain resistance and ease of cleaning.