Are you an insulating glass manufacturer, window manufacturer or joiner? Are you active in the renovation of living space or house construction? Then you should learn more. We will be happy to inform you further.

After a positive assessment of all requirements and a positive first inspection visit including a short test according to EN 1279-6, GMI will issue the RAL quality mark. The receipt of the RAL quality mark is based on 1-2 annual inspections including a short inspection according to EN 1279-6.