Chromite Mullite Composite Refractories from Mexico
Composite shapes blending chromite and mullite for glass tank regenerator checkerwork. Under HTS 6815.91.00 primarily for chromite component. High thermal cycling resistance.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Specify chromite >30% for 6815.91 qualification
• Glass tank documentation differentiates use
• Thermal expansion data supports classification