Sample

Colloidal Silica

Fumed Silica

Precipitated and Acid Washed Silica

20.9% H2O

28.4% H2O

15.2% H2O

23.1% H2O

11.6% H2O

19.5% H2O

Stress at maximum (kPa)

0.000

0.179

0.100

0.186

0.089

0.122

Electric filed at

maximum (kV/mm)

2.57

1.71

2.00

0.86

2.30

1.20

Increase in yield stress (kPa)

0.059

0.086

0.033

Shift to lower electric due to water content (kV/mm)

0.86

1.14

1.10

Difference in water

content (%H2O)

7.5

7.9

8.4