I
|
II
|
III
|
|||
Excellence
|
First Class
|
First Class
|
Passed
|
||
Na2SO4,% >=
|
99.3
|
99
|
98
|
95
|
90
|
Insolubility,% <=
|
0.05
|
0.05
|
0.1
|
1
|
2
|
Mg,% <=
|
0.1
|
0.15
|
0.3
|
0.4
|
0.5
|
Cl,% <=
|
0.12
|
0.35
|
0.7
|
1
|
1.5
|
Fe,% <=
|
0.002
|
0.002
|
0.01
|
0.04
|
--
|
Water,% <=
|
0.1
|
0.2
|
0.5
|
2
|
5
|
Whiteness,% >=
|
80
|
80
|
--
|
--
|
--
|