Caustic Calcined Magnesite 85/15 (MgO/SiO2) from Mexico
85% MgO / 15% SiO2 caustic calcined blend for basic refractory brick production. Specific HTS 2519.90.20.00 classification as 'caustic calcined magnesite' despite silica content typical for refractory formulations.
Duty Rate — Mexico → United States
0%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Refractory industry standard specs (MgO 84-88%) well-established for this HTS
• XRF analysis certificate showing exact MgO/SiO2 ratio prevents reclassification
• Bulk bag labeling must specify 'not for chemical synthesis' use