Component
Sol-Gel
Pyrolysis
Controlled Precipitation
Gibbsite (Bayer)

Al2O3
99.93
99.9
99.73
99.52

SiO2
335
365
1250
300

Fe2O3
65
160
840
270

Na2O
110
195
210
4000

K2O
30
110
100
60

Mn2O3
10
15
10
15

TiO2
40
50
30
45

CaO
20
25
150
60

MgO
40
70
10
35

CuO
25
25
10
15

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Note : all impurities in ppm