Batch

E

Sodium silicate glass [21]

Opal in g

6.25

Dissolved at (in ˚C)

160

140

Dissolution time in h

6

5

Na2O in wt. %

7.56

8.0

Nonalkaline oxides in wt. %

25.41

25.2 (SiO2)

Rm

3.47

3.21

Viscosity in mPa×s

29.3 ± 0.5 (20.9˚C)

21

Refractive index

1.3867 ± 0.0003 (21.7˚C)

1.387

Density in g∙cm−3

1.325 ± 0.0013 (21.1˚C)

1.327