HS Code for Ammonium tungstate

Ammonium tungstate, which includes variants such as ammonium paratungstate (APT) and ammonium metatungstate (AMT), is classified under HS code 2841.80. Heading 2841 covers salts of oxometallic or peroxometallic acids. Unlike vanadates, which fall into a residual category, tungstates (also known as wolframates) have a dedicated subheading at 2841.80. This classification is determined by the presence of the tungstate anion (WO4^2- or more complex polyoxometalate forms) and the ammonium cation. Ammonium paratungstate is a critical intermediate in the metallurgical industry, serving as the primary precursor for the production of tungsten trioxide, tungsten metal powder, and tungsten carbide. The classification logic is based on the chemical's role as an inorganic salt of an oxometallic acid. It is important to distinguish these salts from tungsten oxides (heading 2825) or tungsten metal (heading 8101). Because the HS code 2841.80 specifically names tungstates, it takes precedence over more general headings for inorganic compounds. The classification applies to both the paratungstate and metatungstate forms, as both are salts of the oxometallic tungstic acid.

Products Included

• Ammonium paratungstate (APT)
• Ammonium metatungstate (AMT)
• Ammonium tungstate hydrate
• Ammonium wolframate
• High-purity ammonium tungstate powder

Common Misclassification

Ammonium tungstate is frequently misclassified under HS code 2825.90, which covers other inorganic bases and metal oxides/hydroxides. While it is used to produce tungsten oxides, the salt itself belongs in 2841.80. Another error is using 2841.90 (other oxometallic salts); however, since tungstates have their own specific subheading (2841.80), the residual category 2841.90 should not be used. Additionally, some may confuse it with tungsten ores and concentrates under 2611.00, but ammonium tungstate is a refined chemical product, not a raw ore.

FAQ

What is the HS code for Ammonium tungstate?

The HS code for ammonium tungstate, including ammonium paratungstate, is 2841.80.

What is the difference between APT and AMT in classification?

Both Ammonium Paratungstate (APT) and Ammonium Metatungstate (AMT) are classified under the same HS code, 2841.80, as they are both salts of tungstic acid.