The cast alloys of aluminum contained in the ovens easily saturate gas; gas absorbed by most alloys is hydrogen.
Purpose of degassing is to eliminate the gases contained in the molten mass, in order to ensure the conformity of the chemical composition of the individual alloys used.
The degassing allows to obtain a homogenization of the chemical elements of the alloy and a better result in terms of the specific weight of the alloys, this takes away the classic problems of porosity, in slang called pinholes.
Following treatment are performed laboratory testing with spectrometer, scales for measuring the specific gravity / density after subjecting the specimen melted in vacuum - 0.8 bar.
The video shows the degassing done with the automatic Foundry Taroni on casting aluminum alloy:
