|
Ammonium Paratungstate:
|
Grade
|
APT-0
|
APT-1
|
|
WO3（%min）
|
88.5
|
88.5
|
|
Impurities
（%max）
|
Al
|
0.0005
|
0.0010
|
|
Fe
|
0.0010
|
0.0010
|
|
S
|
0.0007
|
0.0010
|
|
As
|
0.0010
|
0.0010
|
|
P
|
0.0007
|
0.0010
|
|
Mo
|
0.0020
|
0.0050
|
|
Ca
|
0.0010
|
0.0010
|
|
Mg
|
0.0007
|
0.0010
|
|
K
|
0.0010
|
0.0015
|
|
Na
|
0.0010
|
0.0015
|
|
Si
|
0.0010
|
0.0010
|
|
Cu
|
0.0003
|
0.0005
|
|
Mn
|
0.0010
|
0.0010
|
|
Ni
|
0.0007
|
0.0010
|
|
Pb
|
0.0001
|
0.0001
|
|
Bi
|
0.0001
|
0.0001
|
|
Sn
|
0.0001
|
0.0003
|
|
Sb
|
0.0008
|
0.0010
|
|
V
|
0.0010
|
0.0010
|
|
Ti
|
0.0010
|
0.0010
|
|
Cr
|
0.0010
|
0.0010
|
|
Co
|
0.0010
|
0.0010
|
◆ 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.
◆ Scott Density: 1.8-2.6 G/CM3.
◆ Packing:In iron drums with inside plastic bags of 100kg or 200kg net each.
Remarks:
1)APT-0 is high purity matetial for special uses.
2)Material of 40-46micron is mainly used for producing tungsten bar for drawing wire
3)Any special requirement to the products can be discussed.
|
Tungsten Filament
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