MATERIALS

We make industrial ceramic from very quality materials:

- Aluminium – oxide ceramic Al2O3
- C 530 = 75% Al2O3
- C 610 = 62% Al2O3
- C 795 = 95% Al2O3
- C 799 = 99,7% Al2O3
- Zirconium oxide ceramic ZrO2
- Composite ceramic Al2O3 + ZrO2

PROPERTY UNIT ALUMINA CERAMIC
Type to DIN 40685   C 530 C 610 C 795 C 799
Al2O3 - content % 78 62 95 99,7
Specific gravity g/cm3 2,5 2,7 3,68 3,82
Water absorption
(abrasion)		 % 8 - 12 0  0  0 
Hardness Mohs 6 8 9 9
Modulus of elasticity GPa   100 280 300
Flexural strenght N/mm2 30 120 280 300

Coefficient of linear expansion

20 - 100 °C
20 - 300 °C
20 - 600 °C
20 - 1000 °C

 x10 -6/° C 3,5 - 5
3,5 - 5
4 - 6
4 - 7 		5 - 6
5 - 6
5 - 7
5 - 7 		5 - 7
6 - 7,5
6 - 8
7 - 9

5 - 7
6 - 8
7 - 8
7 - 9

Specific heat
(20 - 100) °C		 J/KgK 800 - 900 850 - 1050 850 - 1050 850 - 1050
Thermal conductivity W/mK 1,4 - 2 4 - 6 16 - 28 19 - 30
Maximum thermal stress K 350 150 140 150
Dialectric strendht KV/mm   17 15 17
Max. Temp. use °C 1500 1500 1550 1650
Chemical resistivity   satisfactory good good very good
Thermal shock resistance   very good medium to good medium medium