Grade FW-1 FW-2
Impurity Content (%max)
FE 0.005 0.02
SI 0.002 0.005
CA 0.002 0.005
AL 0.001 0.002
MN 0.001 0.002
MG 0.001 0.002
NI 0.002 0.005
SB 0.0005 0.001
CR 0.001 0.004
AS 0.001 0.002
PB 0.0001 0.0005
BI 0.0001 0.0005
SN 0.001 0.002
CU 0.0005 0.001
MO 0.005 0.01
K 0.002 0.003
NA 0.001 0.003
S 0.001 0.002
P 0.001 0.002
C 0.005 0.01

Type Fsss Scott density Oxygen content
(UM) (g/cm3) max(%)
07 0.6-0.8 1.4-2.2 0.5
09 0.81-1.0 1.7-2.5 0.4
10 1.01-1.5 2.0-2.8 0.3
15 1.51-2.0 2.2-3.0 0.3
20 2.01-3.0 2.6-3.5 0.25
30 3.01-4.0 3.2-4.2 0.25
40 4.01-5.5 3.8-4.8 0.25
55 5.51-7.0 4.0-5.2 0.2
70 7.01-15 4.2-5.5 0.2
150 15.1-25 4.5-6.5 0.1
Physical Properties:
Particle Size Oxygen, Mesh Size
(um) less than (mesh)
<1.0 0.30%
1~2 0.25%
2~3 0.20% -200
3~4 0.15%
4~5 0.10%
5~6 0.10%