Glass Sample

Starting mixtures oxide mol %

Ratio [O/P]

D_R (g/cm²/min)

pH

PbO

Na₂O

Cr₂O₃

P₂O₅

S₁

8

35

2

55

2.95

(3.81 ± 0.20) × 10⁻⁷

6.47 ± 0.50

S₂

18

25

2

55

(3.50 ± 0.20) × 10⁻⁸

6.80 ± 0.50

S₃

28

15

2

55

(1.74 ± 0.20) × 10⁻⁹

6.70 ± 0.50

S₄

38

5

2

55

(3.50 ± 0.20) × 10⁻⁹

6.30 ± 0.50