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Radonja Chemical Industry Sisak (Radonja kemijska industrija Sisak) was a chemical company in Croatia and Yugoslavia and was well-known for the production of organic mercury fungicides and herbicide atrazine. Its development was fast and extremely successful. Successful and rapid development was achieved thanks to the capable management and professional staff that the company had at that time. Radonja had modern production facilities, a rich manufacturing program, developed technical, research and commercial services.

History
Radonja was founded by a decision of the Presidency of the Government of the Republic of Croatia no. 9935/46 of September 10th, 1946. It was decided that the existing tartaric acid plant Resman Zagreb will continue its work under the name Radonja dd, as a factory in Zagreb. Immediately after this, it was decided, that the factory shall be moved to Sisak. The production of tartaric acid in Sisak began in 1948. In 1949 Radonja was annexed by Oxygen Factory Sisak. By the decision of the City People's Committee on May 1, 1953, the oxygen plant was moved to Zagreb. In 1956 Radonja enters the production of auxiliary materials for the rubber industry. Production of pesticides started in 1957, with the production of organic mercury fungicide "Radosan". The range of pesticides was supplemented by the production of liquid and powder insecticides. At the beginning of the 1960s, the production of triazine herbicides began. The production of a wide range of pesticides was rapidly adopted. The iodine production plant that worked within the Iodine Spa of Sisak by the decision of the Sisak Municipal Assembly of 18 December 1957 was added to Radonja. The production range of this plant was expanded in 1959 with the production of clean chemicals. The production of alkaline phosphorus fertilizer began on January 25, 1965. The introduction of production of construction materials (hydraulic lime lime and metallurgical cement) was the consequence of abandoning the production of artificial fertilizer Pelofos. The program was then complemented with products of higher processing quality, production of concrete tiles and auxiliary powder building material. The production of a reagent test, a means for clinical diagnosis, started in 1965. The production program was then expanded with the production of dispersive paint paint for walls, facades, and concrete. Further development of Radonja was based on the modernization of the manufacturing process and on the expansion of the market and the development of cooperative relations with domestic and foreign companies.

Name of company
During its existence, the company changed its name and textual logo. • The first name of the company "Radonja tvornica vinske kiseline Zagreb" was given by the government's decision in 1946. • By the decision of the authorities of Sisak in 1949, the company got the name "Radonja tvornica vinske kiseline i kisika Sisak". • By the decision of the City People's Committee, in 1953 the company changed its name to "Radonja tvornica kemijskih proizvoda Sisak". • By the decision of the Sisak Municipality NO, in 1957, the most famous name of the company "Radonja kemijska industrija Sisak" was established. Under this name, Radonja has reached the peak of its business. • In 1992 the company was renamed "HERBOS d.d." for the manufacture of chemicals and chemical products Sisak. Under this name, the company operated until 2013 when it was liquidated.

Key people
Radonja had the whole thrill of highly capable leaders and expert workers. From the director, according to the results of the work and the length of the mandate, Milan Orlović and Branko Burazor were particularly excited.

Štefica Mesarić, Bogomir Milutinović, Dunja Lešić, Ivan Dumbović, Oliver Pötzl, Berislav Mrgan and many others gave their seal to the company's development.

Production program
The production program comprised the following product groups: • tartaric acid and related products • oxygen • iodine and pure chemicals • auxiliary materials for the rubber industry • Plant protection products • fertilizer • broad consumption chemistry • test reagents for clinical diagnostics • building material • paints and coatings • technical chemicals Over 170 different products.

Technical equipment
At the height of the development of the eighties of the twentieth century, Radonja had 12 production facilities and two special production lines. The company has had top technology and was the leader in its field of use of modern and advanced technology. It had highly developed technical and auxiliary services as well as energy infrastructure.