High-Calcium Aluminate Refractory Blocks from Mexico
Large refractory blocks with over 50% CaO content, fired for use in cement rotary kilns and lime kilns. These constructional goods provide thermal shock resistance and are shaped for furnace linings. Meets HTS 6902.10.50.00 as 'other' refractory goods with dominant calcium oxide.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Provide lab analysis reports confirming CaO percentage and firing process to prevent misclassification as building bricks
• Check for proper marking of dimensions if tiles exceed 3.2cm thickness per US notes for headings 6905/6907
• Obtain end-use statements for industrial furnaces to differentiate from construction materials