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Many information can be found in aluminium-manual, which is being completely revised and will soon be available. In the meantime, please use our glossary for useful word explanations.


Pores greater than 50 nm in diameter.


Segregation in the entire casting; solidification takes place from the outside to the inside, whereby by-elements and alloying elements are found saturated in the centre of the casting.

Massive forming

Spatial distribution of the material through large changes to cross section profiles.

Master alloy

Alloy used exclusively as an addition for the melting process to adjust the composition or to limit impurities.

Material number

Unique identifier of a material; aluminium: first digit = main group, second to fourth digit = quantities of alloy additives, fifth digit = type of alloy.

Material test

Test procedure with which the behaviour and material characteristics of standard material samples or finished components are determined under mechanical, thermal or chemical stresses.

Melting loss

Metal loss during the melting process due to high oxidation tendency of aluminium.


Melting temperature

Temperature at which a material melts or the lowest melting point of the compounds of alloy.

Metal deposition

Manufacture of metal or metal layer from a metal compound; usually a metal salt is reduced to the metal.

Microstructure analysis

Microscopic evaluation of metal structure with regard to the microstructure, precipitation formation, grain size, porosity, shrinkage.

Mill scale

Formed on the outer surface of rolled plates, which have increased residual stress potential due to the forming process; can have a negative impact on subsequent machining processes.