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2528.00.00.50/Kernite Sodium Borate Concentrate/Mexico

Kernite Sodium Borate Concentrate from Mexico

Kernite is a natural sodium borate (Na2B4O7·4H2O) concentrate from evaporated lake beds, used in welding fluxes and herbicides. HTS 2528.00.0050 covers this non-brine natural borate with H3BO3 content below 85% dry weight. Typically exported as crushed or powdered ore.

Duty Rate — Mexico → United States

10%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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Import Tips

• Submit mining provenance docs proving non-brine extraction; test for hydration levels affecting weight basis

• Beware of rehydration during ocean transit impacting declared purity