Calcined Colemanite Borate Concentrate from Mexico
Calcined colemanite is a naturally occurring calcium borate mineral concentrate processed by heating to remove water, used primarily in glass and ceramic manufacturing. It falls under HTS 2528.00.0050 as a calcined natural borate concentrate with less than 85% H3BO3 content on dry weight, excluding borates from brine. This classification covers unrefined mineral forms not chemically separated.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Verify H3BO3 content via lab analysis to confirm under 85% threshold; obtain mineral origin certificates to distinguish from synthetic borates
• Ensure proper packaging to prevent moisture reabsorption during shipping