ammonium paratungstate

Ammonium Paratungstate

Ammonium paratungstate (or APT) is a white crystalline salt of ammonium and tungsten, raw material of Sodium Tungstate and Tungsten Trioxide production.

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Grade classification

Grade APT-0 APT-1
WO3(%min) 88.5 88.5
Impurities(%max) Al 0.0005 0.001
Fe 0.001 0.001
S 0.0007 0.001
As 0.001 0.001
P 0.0007 0.001
Mo 0.002 0.005
Ca 0.001 0.001
Mg 0.0007 0.001
K 0.001 0.0015
Na 0.001 0.0015
Si 0.001 0.001
Cu 0.0003 0.0005
Mn 0.001 0.001
Ni 0.0007 0.001
Pb 0.0001 0.0001
Bi 0.0001 0.0001
Sn 0.0001 0.0003
Sb 0.0008 0.001
V 0.001 0.001
Ti 0.001 0.001
Cr 0.001 0.001
Co 0.001 0.001

Formula: 5(NH4)2O.12WO3.5H2O.
Appearance: Free flowing white crystalline powder with no any other cast or foreign matter.
Ignition Loss: 11.5%max
Fsss: 35-46 micron.
Packing: In iron drums with inside plastic bags of 100kg or 200kg net each.

Remarks:
1) APT-0 is high purity material for special uses.
2) Material of 40-46 micron is mainly used for producing tungsten bar for drawing wire
3) Any special requirement to the products can be discussed.”