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Item
Unit
Technical data
Composition
Data
Remarks
Bulk density
Kg/m3
1250-1800
Al2O3
30-95%
Water Sorption
%
=1
SiO2
24-68%
Heat conduction index
Kcal/mhoC
=0.7
Fe2O3
<0.5
Spalling resistance
oC
1300-1500
CaO
<1.5
Specific heat
Cal/goC
0.15-0.2
Na2O
Refractoriness
20-8004 (three times, without crash)
MgO
<1
Acid resistance
=99
K2O
<2.5
Alkali resistance
=82
Other
Hardness
Mohs
=6.5-7