The chemical formula of Ammonium Paratungstate (APT) is (NH4)6H2W12O40•xH2O. Ammonium metatungstate is a white crystalline powder with a specific gravity of 4 and is easily soluble in water. It decomposes into a relatively stable compound (NH4) 6H2W12O40 after heating at 200-300°C; it finally decomposes into tungsten trioxide when heated above 300°C. It is obtained by the interaction between ammonium paratungstate and tungstic acid and crystallization by low temperature concentration. Used in the manufacture of high-purity metal tungsten, tungsten alloy, and hard alloy.
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