Ammonium Paratungstate
Ammonium paratungstate ((NH4)10[H2W12O42]·4H2O) is a key intermediate salt in tungsten processing, fitting HTS 2841.80.0050 as an 'other' tungstate salt. It is thermally decomposed to produce tungsten oxide for further metal refinement.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If after calcination to tungsten oxide
Converted oxides classify under 2825, not original tungstate salts.
If formulated as fertilizer additive
Chapter exclusions send fertilizer mixtures to Chapter 31.
If mixed with organic stabilizers
Organo-inorganic mixtures excluded from Chapter 28 per notes.
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Import Tips & Compliance
• Provide detailed chemical composition to distinguish from ammonium metatungstate
• Comply with REACH-like regulations for ammonium compounds in import docs
• Watch for bulk vs packaged forms; retail packs may shift to 2842 if complex
Related Products under HTS 2841.80.00.50
Sodium Tungstate Dihydrate
Sodium tungstate dihydrate (Na2WO4·2H2O) is a white crystalline salt derived from tungstic acid, classified under HTS 2841.80.0050 as an 'other' tungstate (wolframate) salt of a peroxometallic or oxometallic acid. It is commonly used in the production of tungsten metal and as a reagent in chemical synthesis.
Potassium Tungstate
Potassium tungstate (K2WO4) is an inorganic salt of tungstic acid used in fireproofing textiles and as a catalyst precursor, classified in HTS 2841.80.0050 as other tungstates. It meets Chapter 28 criteria for chemically defined metal salts.
Calcium Tungstate Powder
Calcium tungstate (CaWO4) powder is a tungstate salt used in fluorescent materials and X-ray screens, under HTS 2841.80.0050 for other tungstates. It qualifies as a chemically defined inorganic compound per Chapter notes.
Magnesium Tungstate
Magnesium tungstate (MgWO4) is a crystalline salt employed in scintillation detectors and phosphors, classified as other tungstates in HTS 2841.80.0050. It is a simple oxometallic salt excluded from other chapters.
Lithium Tungstate Crystals
Lithium tungstate (Li2WO4) crystals serve in nonlinear optics and as flux in metallurgy, falling under HTS 2841.80.0050 as other tungstates. Classified here as unworked chemical compound per electronics doping note.
Barium Tungstate
Barium tungstate (BaWO4) is used in X-ray contrast and ceramics, classified in HTS 2841.80.0050 for other tungstate salts. It adheres to definitions for metal tungstates excluding complex forms.