Ammonium Heptamolybdate from China
Ammonium heptamolybdate (NH4)6Mo7O24·4H2O is a white crystalline powder used as a precursor in molybdenum metal production and as a catalyst in chemical reactions. It falls under HTS 2841.70.10.00 as it is a molybdate salt of ammonium, specifically an oxometallic acid salt per Chapter 28 notes.
Duty Rate — China → United States
16.8%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Verify purity certificate to confirm 'chemically defined' status per Chapter 28 Note 1; ensure SDS includes CAS 12027-67-7
• Common pitfall: mislabeling as fertilizer-grade shifts to Chapter 31