Hydroboracite Crude Concentrate from Mexico
Hydroboracite (CaMgB6O11·6H2O) is a white fibrous calcium magnesium borate mineral extracted from evaporite basins and concentrated via flotation. It is classified in HTS 2528.00.0010 as natural calcium borates, provided no brine separation occurs. Common in fertilizers and glass flux production.
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
• Document concentration process to ensure it qualifies as 'concentrates thereof' without chemical alteration; test for magnesium thresholds
• Obtain phytosanitary certificates if used in agriculture to clear FDA checks
• Monitor particle size declarations to prevent parts classification errors