The future is shaped by us.

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

Business Units

Your specialist for high-tech materials quartz, ceramics and metal.

Quartz / Special glass

Quartz and special glass are ideal for use in the most technologically demanding areas. The combination of unique thermal, mechanical and optical properties makes them indispensable materials for industry and science.


Ceramics offer versatile applications with materials that contribute significantly to your required solution through fine-tuning of properties, application specific finishing and bonding and bonding with other materials.

Refractory metals

A fully integrated supplier offering materials from powder, sheet or rod to fully finished machined, fabricated and 3D printed parts using additive manufacturing. QSIL offers a diverse portfolio of products of the highest quality including an in-house engineering design and modelling service.

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at nine locations

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Experience in manufacturing
of high-tech materials

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Million euro



Our products are the basis for innovative applications.

We develop solutions for your challenges. Because standard products are often not enough, we work hand in hand with you at the early project stage to realize your product vision.


Highest purity and reliability for your requirements.

Medical Technology

From nano to macro.

Industrial Solutions

Innovative solutions for a wide range of industrial applications.


Solutions for the use of light as a tool.

Aerospace technology

Opening new paths and protecting lives.


High-purity components from a single source.


Production technologies for high-tech materials.

QSIL has the latest technologies for manufacturing products from quartz and special glass, ceramics and metals. This know-how enables us to manufacture high precision components from individual pieces to series production, entirely according to the needs of our customers.

Manufacturing process for quartz and special glass

Ceramic shaping technologies

Technologies for the production of products from refractory metals

Assistive Technologies

Plasma Melting Process

Ilmasil® quartz glass is manufactured using our self-developed plasma melting process: In a rotating melting vessel, high-purity quartz sand, which is located on the inner vessel wall as a result of centrifugal force, is melted to form hollow cylinders (billets). An electric arc of high power acts as the energy source. This plasma arc guarantees a constant temperature field over the entire melting chamber and thus causes uniform melting of the crystalline raw material into amorphous quartz glass.


Become part of our success story.

Come join our team.

Qualified specialists for the production and processing of our high-performance materials are among our most valuable assets. They help to secure and further expand our technological lead. As a locally rooted, internationally operating group of companies, QSIL offers employees a wide range of benefits at their respective locations.


Latest news from QSIL.


QSIL invests 20 million euros in new production buildings and melting facilities at Ilmenau site

With the laying of the foundation stone for the "Quarzschmelze 3" production hall, we have reached another milestone in the company's history.

Significantly longer service life for insulators from QSIL

QSIL shows isolators for X-ray systems, computer tomographs or electron microscopes at the Ceramics Expo in Novi/Michigan (USA).
ROBU 2018_comp

ROBU® Glasfilter-Geräte GmbH becomes part of the QSIL group of companies

Materials specialist QSIL grows again and expands its portfolio in the quartz and specialty glass sector by acquiring the leading manufacturer of sintered glass filter elements and glass filter equipment.


Local partner, represented worldwide.

Production sites


Ilmenau – Headquarters & Quartz Glass Production

Hattert – ROBU – Glass filter elements

Auma – Oxide ceramics

Frankenblick – Non-oxide ceramics

Sonneberg – Non-oxide ceramics

Jena – Additive manufacturing

Hermsdorf – Refractory Metals


Winschoten – Quartz and special glass

Great Britain

Calne – Refractory Metals

Sales offices





South Korea