History

1840	American physicists exploring Hawai discover stone wool formed naturally during a volcanic eruption.
1865	Rockwool begins the manufacture of stone wool.
1930’s	Decade of Rockwool in business.
1937	Stone wool production begins at the factory in Hedehusene (Denmark).
1940’s	Decade of wartime, with scarcity of goods.
1949	Rockwool opens a Dutch stone wool factory at IJmuiden.
1950’s	Technical progress.
1960’s	Construction boom and expansion.
1968	Relocation of the Dutch Rockwool stone wool factory to Roermond.
1970’s	Energy crises and new markets; Grodan begins operations.
1970	Development of Grodan substrate for the horticulture market, Grodan offices open in Denmark.
1975	Grodan acquires its first Dutch customers: Firma Boekesteijn (garden cress) and Van Adrichem (cucumbers).
1978:	Incorporation of Grodan in the Netherlands.
1980’s	Continuous development of Rockwool; 13 factories and 5,293 employees.
1990’s	Expansion of Rockwool in Central and Eastern Europe; Rockwool has 21 factories and 7,346 employees.
1996	Rockwool is listed on the Copenhagen Stock Exchange.
1999	Grodan’s 30th anniversary.
2000’s	Grodan is positioned as a solution provider on the basis of the supply of stonewool products in combination with advice and support services; continued internationalization.
2001	Grodan is the first substrate supplier to be awarded Milieukeur (a Dutch Ecolabel’) certification (the Netherlands and Belgium).
2003	Grodan awarded KIWA certification in the Netherlands.
2004	Grodan is active in more than 40 countries in various continents.
2004	Introduction Gronow Crop module (supporting service).
2005	Introduction of a new range of slabs, based on Delta Technology.
2007	Introduction of the 'Next Generation products': a new innovative generation slabs, including Grotop Master, Grotop Expert and Grodan Vital.
2007	Introduction of Grodan's 6-phase advice model.