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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sodium or other metal tungstate
Non-ammonium tungstates classify under 2841.90; cation determines subheading.
If pre-mixed as supported catalyst
Spent or reaction-ready catalysts with carriers fall in 3815 per Chapter notes excluding finished reaction products.
If for industrial bulk import without retail packaging
Certain phosphinates or similar may overlap, but tungstates specifically stay in 2841.
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Import Tips & Compliance
• Provide detailed assay reports showing metatungstate content to distinguish from paratungstate forms
• Check for REACH/ TSCA pre-registration if destined for chemical manufacturing
• Package in moisture-proof containers to prevent hydration changes affecting classification
Related Products under HTS 2841.80.00.10
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.
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.