Caustic Calcined Magnesia Powder from Mexico
Caustic calcined magnesia is magnesium oxide produced by low-temperature calcination of magnesite, resulting in a reactive powder used in chemical and fertilizer industries. It falls under HTS 2519.90.50.00 as 'other magnesium oxide, whether or not pure,' distinct from fused or dead-burned varieties due to its calcination process and reactivity.
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
• Verify purity and calcination method via lab analysis to confirm classification under 2519.90 as 'other magnesium oxide' rather than fused or dead-burned
• Include certificates of analysis showing magnesium oxide content and absence of sintering to avoid reclassification
• Check for additives; small quantities of other oxides are allowed if added before sintering, but document to prevent disputes