The purity of Ammonium Metatungstate is typically categorized based on the application scenario:

Ammonium Metatungstate (AMT) is a white crystalline powder that is easily soluble in water but insoluble in alcohol. It serves as a key precursor in the preparation of tungsten powder, tungstates, and catalysts, and is widely used in electronics, catalysis, and functional materials.

Chemical activity refers to the ease with which a substance undergoes a chemical reaction. Ammonium metatungstate (AMT) exhibits chemical activity primarily through its decomposition and transformation behavior under acidic conditions and thermal treatment. As a precursor to tungsten compounds, AMT plays a vital role in industrial applications and chemical synthesis.

Specific surface area refers to the total surface area per unit mass of a substance, typically measured in m²/g or m²/kg. For ammonium metatungstate (AMT) powder, this includes not only the external surface area of the particles but also the surface area of internal pores, cracks, and other microstructural features. This parameter directly reflects the degree of dispersion and surface activity of the material—finer particles or greater porosity result in a larger specific surface area.