Analyses of tungsten powder from national standard
|
Grades
|
FW-1
|
FW-2
|
FWP-1
|
|
|
Impurity Content(%)Max
|
Fe
|
F.S.S.S< 10um;0.0050
|
0.030
|
0.030
|
|
F.S.S.S≥10um;0.010
|
||||
|
Al
|
0.0010
|
0.0040
|
0.0050
|
|
|
Si
|
0.0020
|
0.0050
|
0.010
|
|
|
Mg
|
0.0010
|
0.0040
|
0.0040
|
|
|
Mn
|
0.0010
|
0.0020
|
0.0040
|
|
|
Ni
|
0.0030
|
0.0040
|
0.0050
|
|
|
As
|
0.0015
|
0.0020
|
0.0020
|
|
|
Pb
|
0.0001
|
0.0005
|
0.0007
|
|
|
Bi
|
0.0001
|
0.0005
|
0.0007
|
|
|
Sn
|
0.0003
|
0.0005
|
0.0007
|
|
|
Sb
|
0.0010
|
0.0010
|
0.0010
|
|
|
Cu
|
0.0007
|
0.0010
|
0.0020
|
|
|
Ca
|
0.0020
|
0.0040
|
0.0040
|
|
|
Mo
|
0.0050
|
0.010
|
0.010
|
|
|
K+Na
|
0.0030
|
0.0030
|
0.0030
|
|
|
P
|
0.0010
|
0.0040
|
0.0040
|
|
|
C
|
0.0050
|
0.010
|
0.010
|
|
|
O
|
Sheet Ⅱ
|
0.20
|
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