Alumina-Silica Refractory Block from China
Dense refractory blocks with a mixture of >50% Al2O3 and SiO2, fired for lining blast furnaces and incinerators. They withstand extreme temperatures and chemical erosion in metallurgical processes. Falls under 6902.20.50 as 'other' refractory bricks/blocks beyond basic siliceous types.
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
• Include manufacturer's spec sheets showing weight percent of Al2O3/SiO2 exceeding 50%
• Declare exact dimensions to confirm not qualifying as 'tiles' under US notes
• Watch for reclassification to 6909 if absorption exceeds refractory limits