Special glass feed through are used to advantage, where sensitive construction units are to be protected against intrusion of pollutants or their operating must be secured in conditioned atmosphere (vacuum, inert gas). Metal-glass meltings can be used in simple designs as single-wire or multi-wire feed throughs and with complex housings, which are completed by soldering, bonding, welding or by means of seals. The typical constructively, physical and customized charac-teristics as well of adjusted feed throughs as - metal-glass feed through for pressure application offer proven and economical solutions for various housing purposes.