GSK e.V.

The GSK Quality Assurance Association for Heavy-Duty Corrosion Protection of Valves and Fittings with Powder Coating (GSK e.V.) is the international industry network for companies that coat valves and fittings with epoxy powder. GSK awards the RAL-GZ 662 Quality Mark (Gütezeichen) to companies who fulfil the strenuous quality-assurance requirements in accordance with the current Quality and Inspection Regulations.

GSK has been a registered association (e.V.) in Germany for over 25 years and represents the general and intellectual interests of its members in the field of epoxy powder coating at international level vis-à-vis legislators, public authorities, politics, business and the media. It provides information on epoxy powder coating in line with RAL-GZ 662 to expert interest groups such as engineers, builders and manufacturers worldwide, as well as local authorities and operators of drinking water, waste water and gas mains.

The globally active GSK members work together in association with international research organisations and independent testing institutes to further deepen their specialist knowledge. The results of the advocacy are thus available to the profession regardless of membership of the association. Through GSK’s concentrated technical expertise, the quality of epoxy powder coating of pipe networks for drinking water, waste water and gas mains is shaped in the general interest internationally in the long term.

Businesses receive further and continuing education from GSK in the field of epoxy powder coating in line with RAL-GZ 662 to further develop their technical expertise, with the aim of achieving future success in international markets.

In its committee comprising international members, the association has adopted Quality and Inspection Regulations and accompanying Implementation Regulations that are constantly being updated in line with the state of the art and international demands, and which are recognised by RAL (German Institute for Quality Assurance and Certification).

Companies who have successfully navigated the process in accordance with the relevant Quality and Inspection Regulations receive confirmation from the GSK Executive Committee that they may carry the RAL-GZ 662 Quality Mark (Gütezeichen). They receive a Process, Product and/or Coating Material Certificate that is valid for the prescribed timer period.

Companies who have started the application process but may not yet carry the Quality Mark are classed as Candidate Members.

The GSK internet database contains up-to-date lists of member companies and their licenses.


GSK is a member of RAL and the Bavarian Industry Association (vbw—Vereinigung der Bayerischen Wirtschaft e. V.).



RAL Quality Mark (Gütezeichen) of GSK
on video

A short video by GSK about its RAL Quality Mark



Our GSK secretariat will be pleased to answer all your enquiries.

Contact form