Aluminium Oxide 

back to overview

 
Alumina is commenly used as high temperature material. It is found in furnaces and due to its high chemical resisitance in the industry. A well known crystal structure is Sapphire. Ruby is a gem stone which ows itís red colour to traces of chromium in the lattice.
 

Material  Melting point chemical stability E-module
(kg/mm
2)
thermal-expansion
coefficient
α (x 10 -6)
Al2O

 2072

very slightly soluble in acid and alkali 4 8-9