Calcined Fire-Clay Powder from Mexico
Calcined fire-clay is a high-alumina clay processed at high temperatures to enhance its heat resistance, used primarily in refractory brick manufacturing. It falls under HTS 2508.30.00.00 as fire-clay, a type of clay suitable for withstanding high temperatures without fusing. This product is essential for furnace linings and kilns.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify alumina content (>30%) via lab certification to confirm fire-clay classification and avoid reclassification as common clay
• Include geological origin documentation, as fire-clay must be naturally occurring high-alumina clay per Chapter 25 notes
• Watch for contamination; mixtures exceeding clay thresholds may shift to heading 3824 as chemical preparations