The recognized platform for the highest quality standards in insulating and safety glass

“For us, the focus is on quality”

Get to know us…

Welcome to the Gütegemeinschaft Flachglas e. V.

The Gütegemeinschaft Mehrscheiben-Isolierglas (GMI) was founded on May 7, 1982 for the purpose of quality assurance and quality monitoring of multi-pane insulating glass (MIG). At the members’ meeting on April 11, 2018, it was then decided to introduce an additional, new quality mark for heat-strengthened single-pane safety glass (ESG-HF) and to rename the quality association Gütegemeinschaft Flachglas (GGF). Every insulating and safety glass manufacturer who wants to label his product with these RAL quality marks must commit to the GGF’s quality and testing regulations.


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“For us, the focus is on quality”

Jochen Grönegräs, Managing Director of GGF, briefly summarizes the most important advantages for holders of the MIG or ESG-HF quality mark in the video above. By means of the quality mark it is immediately recognizable that the product meets the high quality requirements according to RAL. MIG or ESG-HF with the RAL quality mark give planners and builders the security of having purchased a durable quality product – a product that has been thoroughly tested and meets the highest requirements. The quality mark provides the consumer with an unmistakable touchstone that offers him the necessary security for his purchase decision and protects him from unpleasant surprises in the long term. The manufacturer can thus communicate to the consumer in the simplest way possible: “For us, quality is the focus”.

The GLASS CONGRESS 2024 in Lübeck – register now!

The charming city in northern Germany impresses with its rich history. The old town with its gabled houses and the Holstentor offer a picturesque ambience. Visit the highlight of the flat glass industry in 2024!

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Anniversary: ​​40 years of the Flat Glass Quality Association

As a recognized platform for all questions of product quality and usability, we set quality standards: In 2023, the GGF will celebrate its 40th anniversary. Become a member and part of the strong community.

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Orte des Glases

The International Year of Glass 2022 was duly celebrated in Germany, Liechtenstein and Austria. Our marketing campaigns were extremely successful – that’s why we’re continuing! Declare a place of glass now!

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The GGF still has room – become a member too!

Yes, I want!

Bundesverband Flachglas e.V.


The Bundesverband Flachglas e.V. – the industry’s strong voice for standardization & technology, lobbying and PR.

Glas ist Gut


Internet presence of the BF for interested end users with current topics about the material flat glass and its fields of application.

RAL Gütegemeinschaft


Internet presence of the RAL quality marks. RAL quality marks are a reliable guide for consumers, companies and the public sector.

The team from the headquarter of Gütegemeinschaft Flachglas e.V. in Troisdorf

Jochen Grönegräs

Managing Director
02241 872719
0176 63198475

Bettina Zimmermann

02241 872711
0151 23262514

Simone Schwarz

Team Assistant
02241 872730

Ingrid Meyer-Quel

Quality Assurance
07031 4634898

Steffen Schäfer

Standardization and Technology
01 51 726 040 86