Hydrated Magnesium Oxide Powder from Mexico
Partially hydrated form of magnesium oxide (MgO·H2O) used in rubber compounding and flame retardants. Still classified as magnesium oxide under HTS 2519.90.50.00 when from natural calcined sources.
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
• LOI (loss on ignition) tests prove hydration level but maintain MgO classification
• Avoid 'magnesium hydroxide' labeling; classify by chemical identity as oxide
• Specify natural vs. precipitated hydration process