Magnesia Spinel Refractory Blocks from Japan
Pre-fired blocks combining magnesia with spinel (MgAl2O4) where MgO exceeds 50%, used in cement kiln burning zones. Offers superior thermal spalling resistance. Falls under HTS 6902.10.50.00 for magnesium-dominant refractory constructional goods.
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
• Document spinel content calculation method as it contributes to MgO equivalence
• Avoid bundling with metal casings which could trigger Chapter 73 classification
• Certify as finished refractory goods, not parts for further assembly