QSIL is a leading international specialist for refractory, high-temperature and high-purity high-performance materials. These include quartz and special glass, industrial and engineering ceramics and refractory metals. With over 1,000 employees at production sites in Thuringia, the Netherlands, England and China, QSIL achieves an annual turnover of over 200 million euros. The dynamically growing company is active in more than 50 countries. Its customers include major companies from Europe, Asia and America.