Aluminum is Chemical element of group III of Periodic table, atomic number is 13, atomic weight is 26, 98154. Silvery-white metal, lightweight, compressible, highly conductive, melting temperature = 660 ° C
Aluminum purity is more than 99, 99%; it was first obtained by electrolysis in 1920. In 1925, in Edwards’ work there were published some information about the physical and mechanical properties of the aluminum. In 1938 Taylor, Will Smith, and Edwards published an article in which there were some properties of produced in France during electrolysis aluminum with purity of 99, 996%. The first edition of the monograph on the properties of purity aluminum was published in 1967.
High pure aluminum as usual, is easy enough — the density of 2720 kg / mg metal. It is quite warm and electrically conductive, resistant to corrosion and heat-resistant. Pure aluminum is soft and unstable. The surface of pure aluminum is always covered with an oxide pellicle having a melting point of 2050 ° C. This pellicle protects the high pure aluminum from oxidation, giving it resistance to corrosion. Pure aluminum is marked with the letter A and the number indicating the content of aluminum.
Aluminum of particular frequency is marked as A999 aluminum with admixture not more than 0.001%.
Currently, the following classification of aluminum is used:
|Designation||The aluminum content, weight%|
|Aluminum of industrial purity||99,5 — 99,79|
|High-purity aluminum||99,80 — 99,949|
|Super pure aluminum||99,950 — 99,9959|
|High purity aluminum||99,9960 — 99,9990|
|Ultra pure aluminum||over 99,9990|
The company «Slavich» produces 2 types of aluminum: high pure aluminum A5N — 99,999% and ultra pure aluminum A6N — 99, 9999%. The degree of chemical purity according to the classification ALFA Finest Inorganic Research Chemicals and Metals catalogue of JOHNSON MATTEY, is not less than 99.999%.