Ammonium metatungstate is also named AMT, which is a kind of white crystal powder. AMT is the raw material for making tungsten product, and also widely used in alloyed steel, fireproof industries. Further more, it is a good tungsten based flux in oil chemical and ceramic industries. The manufacturing standard of AMT in China is GB/T 23368, which is also used for measuring the content of ammonium metatungstate. Based on different manufacturing degree, the products manufactured out by factories have performed different chemical contents. Standard used manufacturing ammonium metatunstate, AMT is GB/T 23368. The content of WO3 is 90.00% in most Chinese manufacturers, but 91.4~91.5% for Chinatungsten Online. For the different crystalized conditions, AMT can be analyzed as (NH4)6H2W12OnH2O, (NH4)6H2W12O40.XH2O and (NH4)6H2W12O40.
Scanning Electron Microscope (SEM) is a kind of scanning equipment using for micrograph by multiplying objects, which can be metal, powder, vegetables etc. Ammonium metatungstate is one of can-be scanned products. After scanning, the powder of AMT is showing ball shape with inner empty. All the balls are gathered together when the multiply value is low, but with gap when the value large enough, which means that the molecule of AMT are separate actually.