Import Duty for Unglazed Tiles Whether Or Not Rectangular The Largest Surface Area Of Which Is Capable Of Being Enclosed In A Square The Side Of Which Is Less Than 7 Cm

HS Code 6907.22.1005 is classified under Chapter 69 ("Bricks, blocks, tiles and other ceramic goods of siliceous fossil meals (for example, kieselguhr, tripolite or diatomite) or of similar siliceous earths"), specifically within the heading for Of a water absorption coefficient by weight not exceeding 0.5%. It identifies Ceramic flags and paving, hearth or wall tiles; ceramic mosaic cubes and the like, whether or not on a backing; finishing ceramics: > Of water absorption coefficient by weight exceeding 0.5 percent but not exceeding 10 percent: > Unglazed > Tiles, whether or not rectangular, the largest surface area of which is capable of being enclosed in a square the side of which is less than 7 cm.

Calculation involves the ad valorem rate plus fees like MPF. For 6907.22.1005, check if your country of origin qualifies for special treatment here.