2826.90.90.90/Fluorosilicic Acid (Hexafluorosilicic Acid)/Canada

Fluorosilicic Acid (Hexafluorosilicic Acid) from Canada

Fluorosilicic acid (H2SiF6) is produced from phosphate processing, used in water fluoridation. Although fluorosilicates have provisions, concentrated forms fall under HTS 2826.90.90.90 as other complex salts when not specifically provided for. Chemically defined per subheading note.

Duty Rate — Canada → United States

3.1%

Rate breakdown

9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter

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Import Tips

• Declare SiF6 content precisely (20-30%); transport as UN 1778; obtain water treatment end-use certification to avoid chemical weapon concerns