Compound

Clay (%)

Waste glass (%)

Saw dust (%)

SiO₂

56.5

69.7

24.2

Al₂O₃

18.7

3.1

16.5

Fe₂O₃

7.2

0.2

1.7

MgO

1.2

1.9

2.5

CaO

1.8

9.5

33.3

K₂O

Nill

0.8

2.7

Na₂O

0.3

10.1

1.2

MnO

0.7

0

2.3

Other oxides

7.9

4.0

3.5

LOI

5.7

0.7

12.2