Alumina (Al2O3) is a hard, chemically resistant material and has the ability
to withstand very high temperatures in aggressive environments.
Innovacera offers Alumina with various purity levels,
including 99.8% and 99.0%. The level of purity, grain size,
and density required is dependent on the rigors of the application
and the component configuration.
Item
Test Condition
Unit&Symbol
95% Al2O3
99% Al2O3
99.7% Al2O3
The main chemical ingredient
Al2O3
Al2O3
Al2O3
Bulk Density
g/cm3
3.6
3.89
3.96
Maximum Use Temperature
1450°C
1600°C
1650°C
Water absorption
%
0
0
0
ROHS Hardness
≥85
≥89
≥89
Flexural strength
20° C
MPa (psi x 103)
358 (52)
550
550
Compressive Strength
20° C
MPa (psi x 103)
2068 (300)
2600(377)
2600(377)
Fracture Toughness
K(I c)
Mpa m1/2
4 - 5
5.6
6
Coefficient of thermal expansion
25-1000° C
1X 10-6/°C
7.6
7.9
8.2
Coefficient of thermal conductivity
20° C
W/m °K
16
30
30.4
Thermal Shock Resistance
Tc
°C
250
200
200
Dielectricity constant
1MHz.25°C
9
9.7
9.7
Dielectric strength
ac-kV/mm (ac V/mil)
8.3 (210)
8.7 (220)
8.7 (220)
Volume Resistivity
100°C
ohm-cm
> 1013
Shipping: We do international shipping for clients
Special offer: Most of our crucibles are produced to order, please mark clearly height, bottom diameter, top diameter, wall thickness and any special requirements i.e. lips etc. To speed up quotations please supply a drawing and if appropriate, the name of the system in which they are to be used.