Ammonium Bifluoride from Mexico
Ammonium bifluoride (NH4HF2) serves as a chemical intermediate and rust remover. Under HTS 2826.90.90.90 as other complex fluorine salts; Chapter notes confirm ammonium salts of fluorine compounds belong in 2826. Chemically defined inorganic compound.
Duty Rate — Mexico → United States
3.1%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Classify with CAS 1341-49-7 documentation; ship as UN 1727 corrosive; test for free ammonia to prevent reclassification as simple fluoride