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Many industrial vacuum deposition processes require an environment with a controlled composition of the environment: a certain amount of high purity technical gases is then continuously fed into the chambers, using controlled flow valves called MFC (Mass Flow Controllers).
Vaccum processing needs the presencence of a particular environment. But why is a reduced pressure environment necessary and what are the pressures used in the vacuum technique? This are the reasons.
Wide set of processes which are used by industry to deposit thin films, with a wide range of compositions and purposes, over substrate with largely variable composition, taking advantage of a high-vacuum environment.