Alumina-Silica Refractory Block from Mexico
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 — Mexico → 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
• 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