Glass Manufacturing Calcareous Stone from Mexico
Calcareous stone flux for soda-lime glass production, providing network stabilization. Though glass-making, classified under HTS 2521.00.00.00 as limestone used for lime manufacture (soda-lime process). Specific silica-calcia ratios required.
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
• Glass producer specs must reference limestone flux role
• Distinguish from silica sand (2505)