High-Alumina Refractory Firebrick from China
High-alumina refractory firebricks are composed primarily of alumina and silica, fired at high temperatures to withstand extreme heat above 1500°C. They are used in furnace linings and kilns for their excellent thermal shock resistance and durability. Classified under HTS 6902.90.10.20 as refractory bricks other than those made from siliceous fossil meals.
Duty Rate — China → United States
35%
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
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Verify firing temperature exceeds 800°C and refractory properties via ASTM C71 testing to confirm Chapter 69 classification
• Provide mill test certificates showing chemical composition (e.g
• >45% Al2O3) and pyrometric cone equivalent (PCE) for customs
• Avoid misclassification as building bricks (6904); ensure documentation proves high-temperature end-use