Our Roots - the History of the Seelze Chemicals Facility
The historical roots of Seelze Industrial Park extend back to the beginning
of the last century.
1814
Pharmacist Johann Daniel Riedel begins to manufacture pharmaceutical
products in Berlin.
1861
Chemist Eugen de Haën takes over a laboratory for inorganic chemicals
and produces high-purity salts and oxides in Hanover-List.
1902
The de Haën company moves to Seelze.
1928
Riedel and de Haën merge to form the Riedel-de Haën AG, headquartered
in Berlin.
1948
Riedel-de Haën relocates its company headquarters to Seelze.
1955
Casella AG acquires 75% of the share capital in Riedel-de Haën.
1970
Hoechst AG takes over Cassella AG.
1995
Hoechst sells Riedel-de Haën to the American company AlliedSignal
Inc., headquartered in Morristown, New Jersey.
1996
The laboratory chemicals division is hived off as RdH
Laborchemikalien GmbH & Co. KG. Until March 1999 this company is a
joint venture between AlliedSignal Inc. and US laboratory chemicals
manufacturer Sigma-Aldrich.
1997
Riedel-de Haën AG becomes a limited liability company (‘GmbH’).
1998
US company Troy Chemicals takes over the Technical Preservatives
division.
1999
US groups AlliedSignal Inc. and Honeywell Inc. amalgamate to form the
new Honeywell group. Some months later, Riedel-de Haën GmbH is
renamed Honeywell Specialty Chemicals Seelze GmbH.
2001
The old company name of Riedel-de Haën is reactivated as a product
brand name for various inorganic salts.
The historical roots of Seelze Industrial Park extend back to the beginning
of the last century.
