Located at the heart of PRAYON’s industrial site, SILOX Engis is both the SILOX ─ Société Industrielle Liégeoise des Oxydes ─ ... group’s parent company and an industrial production unit in its own right. SILOX Engis produces sulphur dioxide, sodium hydrosulphite-based reducing agents, and an extensive range of zinc oxides that are sold around the world. In addition to its “holding” activities, SILOX (Société Industrielle Liégeoise des Oxydes) runs its own industrial operations. It is an integrated producer of sulphur dioxide (SO2), sodium hydrosulphite-based (Na2S2O4) bleaching and reducing agents, and a broad range of zinc oxides (ZnO) The plant production site of Engis (Belgium) is part of the SILOX Holding. read more