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.

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.

2841.80.00Same rate: 30.5%

If other rare-earth tungstates present

Statistical suffixes distinguish, but heading remains 2841.80 for ammonium.

2833.29.40.00Higher: 38.7% vs 30.5%

If complex with sulfates

Double salts with sulfates classify in 2833 per Chapter notes on complex salts.

3802.90.50.00Higher: 39.8% vs 30.5%

If activated for fire retardants

Chemically modified for specific end-use may shift to activated compounds.

Not sure which classification is right?

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Import Tips & Compliance

Use HDX or XRPD analysis documentation to prove crystalline tungstate structure

Comply with EPA TSCA inventory listing for new chemical import notifications

Watch for reclassification if dissolved—solutions may fall under different preparations

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 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.

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.