History

1908	Später-von-Oswald-Group, steel trade, with its managing director Fritz Hamm sets up the Agricultura GmbH, Dusseldorf, for distributing Thomas slag as a fertiliser.
1912	Formation of Fritz Hamm GmbH, Dusseldorf; purpose of the company: sulphuric acid trading.
1917	In order to manufacture sodium sulphate and hydrochloric acid, the Chemische Werke Rombach GmbH, Oberhausen, is established.
1931	Production of sulphuric acid, battery acid and mixed fertiliser is started in Oberhausen.
1971	Concordia Berg AG takes over Chemiewerke Curtius GmbH, Duisburg, and builds a sulphuric acid plant.
1976	Within a necessary reorganisation of Concordia Berg AG, the major stockholder, Schering AG, Berlin, withdraws and takes over the four companies.
1981	Schwering AG consolidates the four companies to Hamm Chemie GmbH, Dusseldorf.
1983	Windmill BV purchases Hamm Chemie GmbH from Schwering AG.
1986	Norsk Hydro Group, managed from Oslo, takes over the company.
1989	Production of hydrochloric acid and sodium sulphate is extended by a Mannheim furnace.
1997	Building of a recycling unit for treatment of spent pickle solutions from the galvanizing industry, leading to solutions of iron (II) chloride and zinc (II) chloride.
2000	Closing down of hydrochloric acid and sodium potassium sulphate production.
2001	Take over of the production site Oberhausen by the new founded Balver Chemieservice GmbH as a manufactoring, storage and handling company and take over of the trading activities by also new founded Hamm Chemie GmbH as a distributing company.