No

item

Unit

Index

1

color

White powder

2

Water content  105°C  

2h%

4.0-7.0

3

Loss on ignition  1000°C 

%≤

7.0

4

PH value

6.7-7.1

5

Specific area

m2/g

170-230

6

Oil absorption

 cm3/g 

2.10-2.50

7

SiO2 content

%≥

93

8

Na2SiO4 content

%≤

0.8

9

Fe2O   

300

10

Average size               

 μm 

24.0-32.0

11

Particle size distribution

40 μm Cumulative distribution >90%