SiO2
72.29
Al2O3
21.71
K2O
2.7
Na2O
0.95
CaO
0.85
MgO
0.12
Fe2O3
0.05
IL
0.54
Acid resistance
99.8
Main technical indexes:
Item
Unit
data
Standard
Bulk density
G/m3
2.21-2.24
HG/T3210-1986
Aperture ratio
%
9.3-10.5
HG/T3210-1986
Water adsorptivity
%
4.2-4.7
GB/T8488-2001
Thermal shock resistance
950-20°C
not crackle after 10 times after sudden change in temperature
GB/T8488-2001
Elastic moduli
Mpa
2138
DIN
Compression strength
Mpa
123
JC424-91
Thermal conductivity
W/m.k
1.175
DIN
Expansion coefficient
1/°C
3.2×10-3
DIN
Expansion rate
%
0.31
DIN
Acid-resistance rate
%
?99.8
GB/T8488-2001