|
指标\级别
|
特级
|
一级
|
二级
|
三级
|
四级
|
|
SiO2≥
|
60%
|
57%
|
52%
|
47%
|
35%
|
|
MgO≥
|
30%.
|
31%
|
31%
|
31%
|
31%
|
|
CaO≤
|
0.65%
|
0.7%
|
1.0%
|
1.5%
|
0.5%
|
|
Fe2O3≤
|
0.3%
|
0.4%
|
0.4%
|
0.5%
|
0.5%
|
|
AL2O3≤
|
0.3%
|
0.3%
|
0.5%
|
0.5%
|
0.5%
|
|
白度≥
|
90
|
89
|
87
|
86
|
85
|
|
烧失量≤
|
6%
|
10%
|
13%
|
17%
|
25%
|
|
通过率
|
98%
|
98%
|
98%
|
98%
|
98%
|
|
水分
|
0.3%
|
0.3%
|
0.3%
|
0.3%
|
0.3%
|
|