QSIL Group.

The QSIL Group has been the leading specialist for refractory, high-temperature as well as high-purity high-tech materials for 60 years.

The company

Global materials specialist & partner for the development of sophisticated solutions from high-performance materials

Global materials specialist & partner for the development of sophisticated solutions from high-performance materials

For decades, we have been shaping the technological future with products made of quartz and specialty glass, technical ceramics and refractory metals.

At our nine company locations in Germany, the Netherlands and England, as well as with sales partners around the world, we develop and manufacture components precisely to measure in customer-specific shapes, dimensions and batch sizes. We supply large corporations in numerous industries and fields of application as well as small and medium-sized companies.

Our experience and distinctive technological strength make QSIL the perfect advisor and service provider in developing innovative and forward-looking solutions for today’s technological challenges. Our customers benefit from the complete range of high-purity, high-melting-point and high-temperature high-performance materials of the highest quality. Worldwide and yet from a single source. Contact us – we will be happy to advise you!


Making progress means continuously getting better.

Continuously getting better and better – that ensures our success. Today and in the future. That’s why we work every day to optimize our processes. Be it in terms of quality, energy expenditure or environmental compatibility. Always with the goal of being better tomorrow than we were yesterday.

Plant QSIL GmbH Quarzschmelze Ilmenau

Plant QSIL Nederland B.V.

Plant QSIL Ceramics GmbH

AMS Occupational safety with system

Our Board of Directors

Expertise - our key to success.

The long and wide-ranging experience of our management enables us to lead the company with vision and to secure a promising future.

Executive directors

Heinz Fabian

Managing Director and Co-CEO

Heinz Fabian (born 1961) studied physics at the Westphalian Wilhelms University in Münster and at the University of California in Irvine (USA). Prior to joining QSIL, he worked for a leading global technology company in the quartz glass business segment, focusing on the semiconductor and fiber optic markets. Most recently, he was responsible for the global quartz business with subsidiaries in Europe, Asia and the USA. In addition to strong market know-how, he has extensive knowledge of technology and holds numerous patents.

As Managing Director and Co-CEO, Heinz Fabian is responsible for Sales & Marketing and Innovation throughout the Group.

Michael Keitz

Managing Director and Co-CEO

Michael Keitz (born 1977) studied business administration at the University of Bayreuth and the University of Leipzig. After graduation, he worked for large auditing firms and was appointed as a tax consultant. Before joining QSIL, he worked in the automotive supply industry as Head of Finance (CFO) and was responsible for accounting, controlling, reporting, IT and human resources.

As Managing Director and Co-CEO, Michael Keitz is responsible for Group-wide operations and for Human Resources, IT, and Legal & Compliance.

Erik Neuberg


Erik Neuberg (born 1982) studied business administration at the TU Bergakademie Freiberg and the Central European University in Budapest. Prior to joining QSIL, he worked for a Big 4 accounting firm from 2006 – 2011 and for a leading private bank in Corporate & Investment Banking from 2011 – 2020. He has many years of experience in corporate finance and in the implementation of corporate transactions. As a consultant, he has accompanied the implementation of all major corporate transactions of the QSIL Group since 2016.

Erik Neuberg as CFO has Group-wide responsibility for Finance, M&A and Corporate Development. He is also the local managing director of some group companies.

Non-executive directors

Stephan Behr (born 1957) completed his vocational training as an electronics technician and studied technical and biomedical cybernetics at the Technical University of Ilmenau from 1978 to 1984. From 1984 to 1990, Stephan Behr worked as a software developer, first in a mechanical engineering company and then in an engineering office for automation in the clothing industry. In 1990, Stephan Behr and a partner founded IBYKUS AG in Erfurt. Stephan Behr was a member of the Board of Management until 2000. In 2000, Stephan Behr founded the investment company SEMENTIS GmbH, through which he holds a stake in QSIL. From 2005 to 2018, he was chairman of the board of QSIL.

Dr. Helmut Vorndran is the managing sole shareholder of the family office VM Capital GmbH based in Düsseldorf (“VMCap”, www.vmcap.com). The company’s primary investment focus is on established companies in value-added manufacturing industries, information and communications technology, and renewable energy with sales of €10 million or more. To date, VMCap has been active in more than 60 corporate transactions, including four very successful IPOs in Frankfurt and London, of which Ersol Solar Energy AG, Erfurt, and Exceet Group SE, Luxembourg, are the most prominent IPOs to date.

Founded in 2000, VMCap today exclusively invests its shareholders’ own funds and currently manages “assets under management” in corporate investments, fund investments in private equity and venture capital, infrastructure projects and real estate for more than €400m. The entire group of companies employs around 1,500 people.

Prior to founding VMCap, Helmut Vorndran acquired 100% of Rolf Schnakenberg GmbH & Co. KG, a market leader in event technology in an MBI transaction, managed and successfully sold the company to an industry competitor. Prior to that, he worked for 11 years for the U.S. consulting firm A.T. Kearney in Munich and Tokyo, where he was involved in more than 100 consulting projects, particularly for clients in the energy, chemicals, pharmaceuticals and consumer goods sectors. His most recent position at A.T. Kearney was Vice President Worldwide and Managing Director of all Japanese consulting activities in Tokyo-based A.T.Kearney K.K.

He successfully completed his diploma studies in business administration at the University of Würzburg and was awarded the degree of Dr. rer. pol. PhD.

Ellen Stellwagen (born 1972) studied law at the Albert-Ludwigs-University in Freiburg and at the Julius-Maximilians-University in Würzburg and passed both state examinations. During her traineeship she also worked for Arthur Andersen in Eschborn. Since 1999 she has been working for Franken-Treuhand GmbH Wirtschaftsprüfungsgesellschaft Steuerberatungsgesellschaft in Würzburg. In 2003 she was appointed as a tax consultant. Since 2010, Ms. Stellwagen has been a managing partner of Franken-Treuhand GmbH. In addition, she has been working in her own law firm since 2003 as a lawyer specializing in business and corporate law.

Chris Förster (born 1971) studied business administration at the Georg-August University in Göttingen. After completing his studies, he worked for Sachsenring Automobiltechnik AG in Zwickau from 1997 to 1999. He then moved to IBYKUS AG in Erfurt and was ultimately CFO of the X-FAB Group, also based in Erfurt, from 2001 to 2017. Following the successful IPO of the X-FAB Group in spring 2017, he moved full-time to FC Carl Zeiss Jena Fußball Spielbetriebs GmbH, which he has headed as Managing Director – initially on a voluntary basis – since January 2013.