High-Alumina Refractory Firebrick from Japan
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 — Japan → 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
• 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