Mullite Refractory Brick from Mexico
Mullite refractory bricks, made from sintered mullite (3Al2O3·2SiO2), offer superior creep resistance for glass tank regenerator checkers and rotary kilns. Fired after shaping to ensure impermeability to gases. Covered by HTS 6902.90.10.20 for other refractory bricks.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Submit X-ray diffraction (XRD) analysis proving mullite phase for accurate HTS verification
• Ensure bricks meet minimum dimensions for 'constructional goods'; small pieces may shift to 6903
• Bundle with furnace installation invoices to demonstrate industrial end-use, avoiding consumer goods misclass