Ammonium Paratungstate Properties

Ammonium paratungstate (or APT) is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH₄)₁₀(H₂W₁₂O₄₂)·4H₂O. Its shape is like sheet or needle.  It is insoluble in water and alcohol. Ammonium metatungstate is very versatile and can be used as catalysts, capacitors, nuclear shielding, flame retardants, corrosion inhibitors raw materials, but also excellent raw materials in the preparation of ultra fine tungsten powder, tungsten heavy alloy powder, phosphotungstic acid, arsenic acid, silicon tungstate.

It has different molecular formula under different crystallization condition:
(1)3(NH4)2O - 7WO3 - 6H2O

(2)5(NH4)2 - 12WO3 - 5H2O

(3)5(NH4)2O - 12WO3 - 5H2O

(4)5(NH4)2O - 12WO3 - 11H2O


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