Ammonium Metatungstate(AMT)

Ammonium metatungstate, also known as AMT, is a tungsten chemical in the form of highly soluble hydrated crystals. AMT produced by Chinatungsten Online to meet stringent demands in the catalyst, medical, semiconductor and other high-technology industries. It is also used in materials research and analytical chemistry. At room temperature, aqueous solutions can be saturated up to 70% by weight of contained WO3. This equates to 1.6 kilograms per liter or 13.3 pounds per gallon.


Physical Property
Chemical Formula: (NH4)6H2W12O40·xH2O
Molecular Weight: 2956.30
EINECS NO.: 234-733-4
CAS NO.: 12028-48-7
Melting Point: 100 °C

Chemical Property

Grade AMT-A
WO3 Content (≥%min) 91.0
Impurities (%max)
Element Al As Bi Ca Cu Fe Mg K Mn Mo
MAX 0.0010 0.0010 0.0001 0.0010 0.0005 0.0020 0.0005 0.0010 0.0010 0.0030
Element Na Ni P Pb S Sb Si Sn Ti V
MAX 0.0020 0.0005 0.0007 0.0001 0.0030 0.0005 0.0010 0.0010 0.0010 0.0010

AMT is a source of high-purity, water-soluble tungsten which is essentially free of alkali and other metallic impurities. It is mainly used as a raw material for the production of tungsten catalysts for a variety of reactions including oxidation, hydroxylation, hydrogenation, and polymerization. Suitable carriers can be impregnated with alkali-free solutions of tungsten and processed to remove the water and ammonia. Such catalysts are used by the petrochemical industry.

Other applications include: reagents for chemical analysis such as for medical diagnosis; source material for the preparation of high-purity WO3 used as a thin-film substrate for certain semiconductor devices; high-purity source material for research in tungsten chemistry; source material for the DeNOx catalyst industry; as a precursor to a variety of POM (polyoxometalates).

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