Glass

Oxide contend [wt%]

SiO₂

B₂O₃

Al₂O₃

Na₂O

K₂O

CaO

MgO

Others

Container glass

Flint

72.5

-

1.5

14.0

0.5

11.0

-

<0.05 Fe₂O₃; 0.2 SO₃;

Green

72.0

-

1.0

15.0

-

8.5

2.0

0.4 Fe₂O₃; 0.05 SO₃; 0.25 Cr₂O₃

Float glass

70.0

-

1.0

14.0

0.8

9.0

5.0

0.08 Fe₂O₃; 0.3 SO₃

E-glass

54.5

6.6

14.0

0.8

0.2

22.1

0.6

0.5 TiO₂; 0.2 Fe₂O₃; 0.5 F₂

Glass wool

64.0

4.5

3.5

15.5

1.2

7.0

3.0

0.25 Fe₂O₃; 0.15 SO₃