Natural Boric Acid Powder from Rasorite from Mexico
Rasorite (refined kernite) yields natural boric acid through concentration and limited processing, containing ≤85% H3BO3 on dry weight basis. This product qualifies for HTS 2528.00.00 as it derives from solid mineral deposits, not brine, and serves agriculture and glass industries. It's distinguished from synthetic boric acid by its natural impurity profile.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Submit lab analysis proving H3BO3 ≤85% dry weight; exceedance triggers synthetic classification
• Include chain-of-custody docs from mine to ensure no brine extraction methods were used