Chemical Composition of Common Bonding Clays
Type of Clay
Ordinary Clay
Bentonite
Fire Clay
Silica SiO
2
53.7
61.5
45.1
Alumina (Al
2
O
3
)
25.4
22.1
33.4
Iron oxide (Fe
2
O
3
)
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 (TiO
2
)
0.62
0.22
1.55
Alkalis (K
2
O + Na
2
O)
3.12
1.56
0.83
Loss on ignition
7.8
5.8
14.6
Fusion Temperature
o
C
1390
1330
Above 1500
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