DEEN COMPANY MATERIAL TECHNOLOGIES PRODUCTS & SOLUTIONS SERVICE HOMECOMPANYABOUT QSIL About QSIL QSIL is a leading producer of fused quartz products, which are sold under the trademark ilmasil® and PH. Its products are widely supplied throughout the global market from the factories in Germany and The Netherlands. The sole focus of QSIL is the manufacture of fused quartz. This covers the raw material treatment, the fusion of heavy wall cylinders, the manufacturing of small and large diameter tubes, and the fabrication of customized products. With many years' experience in the melting and fabrication of fused quartz, as well as having state of the art processing technologies and quality control equipment, QSIL has unique capabilities to supply our customers with products of the highest quality. As a result, QSIL materials have been certified by leading OEMs. Our worldwide customer base relies on the quality and performance they receive from QSIL’s products. QSIL’s main objective is to supply products which bring the highest level of value to our customers. Germany The Netherlands Milestones "From the first fused quartz to today's QSIL" COMPANYMATERIALTECHNOLOGIESPRODUCTS & SOLUTIONSSERVICE IMPRINTPRIVACY POLICYDISCLAIMERSITEMAP QSIL AG / Gewerbering 8 / 98693 Ilmenau / Germany QSIL GmbH Quarzschmelze Ilmenau / Gewerbering 8 / 98693 Ilmenau / Germany QSIL Nederland B.V. / H.M. Brouwerstraat 1 / 9672 AG Winschoten / The Netherlands QSIL Ceramics GmbH / Triptiser Straße 22 / 07955 Auma-Weidatal / Germany QSIL Ingenieurkeramik GmbH / Gewerbepark 11 / 96528 Frankenblick / Germany QSIL is the specialist when it comes to advanced solutions made from high-performance materials, fused silica and engineered ceramics. From the prototype to the serial production of complex special components made of individually optimized materials - QSIL offers an extensive product and material portfolio.

DEEN COMPANY MATERIAL TECHNOLOGIES PRODUCTS & SOLUTIONS SERVICE The QSIL Management: MICHAEL KEITZ ERIK NEUBERG HOMECOMPANYMANAGEMENT BOARD Michael Keitz More about Michael Keitz Erik Neuberg More about Erik Neuberg COMPANYMATERIALTECHNOLOGIESPRODUCTS & SOLUTIONSSERVICE IMPRINTPRIVACY POLICYDISCLAIMERSITEMAP QSIL AG / Gewerbering 8 / 98693 Ilmenau / Germany QSIL GmbH Quarzschmelze Ilmenau / Gewerbering 8 / 98693 Ilmenau / Germany QSIL Nederland B.V. / H.M. Brouwerstraat 1 / 9672 AG Winschoten / The Netherlands QSIL Ceramics GmbH / Triptiser Straße 22 / 07955 Auma-Weidatal / Germany QSIL Ingenieurkeramik GmbH / Gewerbepark 11 / 96528 Frankenblick / Germany QSIL is the specialist when it comes to advanced solutions made from high-performance materials, fused silica and engineered ceramics. From the prototype to the serial production of complex special components made of individually optimized materials - QSIL offers an extensive product and material portfolio.