Physical and chemical properties:
|
Physical and chemical properties
|
Superior grade
|
Top grade
|
二等品
|
Qualified product
|
Whiteness (%)
|
≥90
|
≥85
|
≥83
|
≥81
|
Dust (mm2/g)
|
≤0.4
|
≤0.8
|
≤1.0
|
≤1.2
|
Calcium carbonate (%) CaCO3
|
≤3.0
|
≤4.0
|
≤6.0
|
≤8.0
|
Loss on ignition(800°C)(%)
|
≤7.0
|
≤8.0
|
≤10.0
|
≤12.0
|
Fineness, 325 mesh(45μm)
|
≥98
|
PH value
|
7-9
|
Moisture (%)
|
≤0.5
|
|