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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.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
🇨🇳China5.5%+25.0%30.5%
🇲🇽Mexico5.5%—5.5%
🇨🇦Canada5.5%—5.5%
🇩🇪Germany5.5%—5.5%
🇯🇵Japan5.5%—5.5%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

2825.90Lower: 13.7% vs 30.5%

If supplied as anhydrous tungstic acid or oxide

Tungstic acid/oxides fall under heading 2825 for metal oxides, not salts.

2839.19.00.00Higher: 36.1% vs 30.5%

If containing phosphotungstate complex

Complex salts like phosphotungstates are classified in 2839 as other treated salts.

2842.90Lower: 13.3% vs 30.5%

If double or complex salt with gold/other metals

Chapter notes direct double/complex salts to 2842.

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Import Tips & Compliance

• Verify purity and hydration state via certificate of analysis to confirm classification as chemically defined tungstate

• Ensure SDS and proper hazardous material labeling for transport, as it may be regulated

• Avoid misclassification as tungsten oxide (2825.90); tungstates are distinct metal salts

Related Products under HTS 2841.80.00.50

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.

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.