Ammonium Paratungstate
Ammonium paratungstate (APT) is a white crystalline powder with the formula (NH4)10[H2W12O42]·4H2O, used primarily as an intermediate in tungsten metal production. It falls under HTS 2841.80.0010 as it is a tungstate salt of ammonium, specifically a peroxometallic acid derivative classified in this subheading for ammonium tungstates.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing impurities exceeding chemically defined thresholds
May shift to broader 2841.90 if not meeting Chapter 28 Note 1 purity standards for chemically defined compounds.
If classified as antimony-based rather than tungsten
Antimonates fall under 2825, but pure tungstates remain in 2841; mislabeling composition changes heading.
If blended with fertilizers for agricultural use
Mixtures with nitrogen/phosphorus compounds may classify as mineral/chemical fertilizers per Chapter 31 notes.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify purity and chemical composition via lab analysis to confirm classification as chemically defined ammonium tungstate
• Include Safety Data Sheets (SDS) and Certificates of Analysis in documentation to avoid customs delays
• Ensure proper hazardous material labeling if shipped in powder form to comply with DOT regulations
Related Products under HTS 2841.80.00.10
Ammonium Metatungstate
Ammonium metatungstate (AMT) is a soluble powder (NH4)6[H2W12O40]·xH2O used in catalysts, fire-retardant treatments, and plating solutions. Classified under HTS 2841.80.0010 as an ammonium salt of tungstic acid, fitting the peroxometallic salts category.
Ammonium Tungstate Powder 99% Pure
High-purity ammonium tungstate powder (99% assay) serves as a source for tungsten compounds in X-ray screens and phosphors. It is an ammonium salt of wolframic acid, directly matching HTS 2841.80.0010 for ammonium tungstates.
Ammonium Wolframate Crystals
Ammonium wolframate crystals are metatungstate form used in photographic chemicals and corrosion inhibitors. As a defined inorganic salt of tungsten, it precisely fits HTS 2841.80.0010 under ammonium tungstates.
Technical Grade Ammonium Tungstate
Technical grade ammonium tungstate (85-90% purity) is used in fabric fireproofing and leather tanning. It qualifies under HTS 2841.80.0010 as an ammonium peroxometallic salt despite lower purity, meeting basic tungstate definition.
Ammonium 12-Tungstophosphate
Ammonium 12-tungstophosphate is a heteropolyacid salt (NH4)3PW12O40 used as an industrial catalyst. As a complex tungstate of ammonium, it falls under HTS 2841.80.0010 per notes on complex salts.
Diammonium Tungstate Solution Concentrate
Concentrated aqueous solution of diammonium tungstate used in wire drawing lubricants. Though in solution, the active ingredient is ammonium tungstate salt, classified under HTS 2841.80.0010.