Chemical Composition of Common Bonding Clays |
|
|
|
|
| Type
of Clay |
Ordinary
Clay |
Bentonite |
Fire
Clay |
|
Silica
SiO2 |
53.7 |
61.5 |
45.1 |
|
Alumina
(Al2O3) |
25.4 |
22.1 |
33.4 |
|
Iron
oxide (Fe2O3) |
6.94 |
4.2 |
2.50 |
|
Calcium
oxide (CaO) |
0.34 |
1.74 |
1.20 |
|
Magnesium
oxide (MgO) |
2.04 |
2.27 |
0.94 |
|
Titanium
oxide (TiO2) |
0.62 |
0.22 |
1.55 |
|
Alkalis
(K2O + Na2O) |
3.12 |
1.56 |
0.83 |
|
Loss
on ignition |
7.8 |
5.8 |
14.6 |
|
Fusion
Temperature oC |
1390 |
1330 |
Above
1500 |
|
|
|
