Mitglieder der Gütegemeinschaft Mehrscheiben-Isolierglas

If a product manufactured by a manufacturer of insulating glass passes this system test and fulfils the requirements for internal and external monitoring, the manufacturer is awarded the RAL quality label for multi-pane insulating glass. In this case the manufacturer undertakes to monitor its production internally by taking random samples and to record the results in a specific test protocol on a daily basis. This so-called internal monitoring is in turn monitored by an independent external testing institution. 

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