The Xella Group develops, manufactures and markets building materials, dry lining panels, lime and limestone products. With its Ytong, Hebel and Silka brands, Xella is one of the world's largest manufacturers of autoclaved aerated concrete and calcium silicate units. The Multipor brand is synonymous with non-flammable mineral insulation boards. Fermacell and Fermacell Aestuver provide dry lining and fire protection solutions while Fels is one of Europe's leading producers of lime and limestone products. The Xella group bundles the expertise and know-how of Ytong, Multipor, Silka, Hebel and Fermacell and is continuously developing these brands. Xella is one of just a few European building material companies to operate its own Research and Development Center which focuses its work on three main areas: Product and process research, applied research and construction physics. Xella products are sustainable both in manufacture and use. They also undergo a process of continuous developmen