Industry was based on the production of glassware and porcelain during the 19th and 20th century with many large and famous companies (porcelain brands: "Henneberg" (est. 1777), "Metzler & Ortloff" (est. 1873)). The porcelain industry did not survive the structural change after German reunification in 1990, so that factories closed like most in Western Germany earlier during the 1970s and 1980s. The glass industry always concentrated on laboratory glassware such as thermometers, test tubes and other chemical and medical requisites. During the GDR period, all the glass factories of Ilmenau and the surrounding villages were centralized in a new Kombinat, opened in 1976 with 5,000 workers in Ilmenau being one of the biggest glass producers within the Comecon states. After reunification, the factory survived and is still a leading company for laboratory glassware in Germany, nevertheless, due to rationalization efforts during the 1990s, the number of employees decreased to 225. After 1990, new branches were established in Ilmenau. Mechanical engineering and polymer processing are now playing an especially important role in Ilmenau, as is software engineering. These new sectors benefit from the vicinity to the university and the research institutes. In 2012, there were 26 companies in industrial production with more than 20 workers employing 1,500 persons and generating a turnover of €170 million.