Ceramic Flags, Paving & Wall Tiles — Water Absorption Exceeding 10%

Classification is determined by the actual water absorption coefficient measured per an accepted test method (ASTM C373 or ISO 10545-3). A result above 10% places the tile in 6907.23 regardless of how close it is to the boundary. If a manufacturer's certificate and an independent lab result conflict, CBP will typically rely on the independent test. Importers dealing with borderline products should obtain multiple test certificates and consider a binding ruling request to lock in the correct subheading before large shipments arrive.

Glazed and unglazed tiles within 6907.23 are classified into separate 10-digit lines — for example, 6907231000 series for unglazed and 6907232000 series onward for glazed — and may carry different normal trade relations (NTR) duty rates. Additionally, any applicable antidumping or countervailing duty order may have scope language that distinguishes glazed from unglazed products, so confirming the finish type is essential for both classification and trade-remedy compliance.