Chemical and Physical Properties
The products are made from Alpha alumina, and has characteristics of low silica content( SiO2<0.2%), high degree of alumina content(Al2O3>99%) and high strength. It is an excellent choice for high temperature and stream applications where silica leaching must be held minimal. And the excellent thermal properties combined with its high density and ability to withstand operating temperatures to 1500oC, also make it a good choice for heat retention or equilibration media.
& Typical chemical composition
|
SiO2 |
0.15-0.2 |
MgO |
0.03-0.05 |
|
Al2O3 |
99-99.2 |
CaO |
0.04-0.07 |
|
Fe2O3 |
0.05-0.2 |
K2O |
0.1-0.15 |
|
TiO2 |
0.15-0.2 |
Na2O |
0.2-0.25 |
|
Soluble Fe: <0.01% | |||
& Typical physical properties
|
Density |
g/cm3 |
3.5-3.6 |
|
Water Absorption |
% |
2-3 |
|
Compressive Strength |
N /mm2 |
3K |
|
E-M |
GPa |
60 |
|
Mohs Hardness |
Scale |
9 |
|
Specific heat, 20℃-100℃ |
J/kgK |
840 |
|
Thermal Conductivity 30℃-100℃ |
W/mK |
1-1.5 |
|
Coefficient of thermal expension |
(20℃-600℃)10-6K-1 |
4.7 |
|
Heat Resistance |
Up to ℃ |
1500 |
& Sizes, size tolerances,packing density, specific surface, void fraction and compressive strength for alumina balls.
|
Size
(Inch)-(mm)
tolerance |
Packing density
(kg/m3) |
Spec.surface (m2/m3) |
Void space
(%) |
Compressive strength per ball (kg) |
|
1/8”-3mm 2.5-3.5mm |
2000 |
720 |
44 |
60 |
|
1/4”-6mm 5.5-6.5mm |
2000 |
520 |
44 |
160 |
|
3/8”-9mm
8-10mm |
2000 |
360 |
44 |
240 |
|
1/2”-13mm 12-14mm |
2000 |
275 |
45 |
450 |
|
3/4”-19mm 18-20mm |
2000 |
190 |
45 |
520 |
|
1”-25mm
24-26mm |
2100 |
144 |
45 |
800 |
|
1?”-32mm 31-33mm |
2200 |
120 |
45 |
850 |
|
1?”-38mm 37-39mm |
2200 |
100 |
45 |
920 |
|
2”-50mm
48-53mm |
2200 |
80 |
45 |
1000 |