By 1924 the first blast furnace, casting hall, coke plant, and an electricity generating plant powered by waste gases from the coke ovens and blast furnaces were ready, and the second of two blast furnaces, begun in 1919, became operational in 1926. Both blast furnaces were constructed to a design by American company "Freyn, Brassert &Co.". The coking plant continued to be expanded throughout the 1920s and 30s, and after World War II. Coal tar, a by-product from coking, was used by the chemical works Cindu ("Chemische Industrie Uithoorn"), and cleaned coke oven gas was used in the site's power plant and in nearby municipalities. A brickworks ("NV Phoenix Maatschappij voor Vervaardiging van Hoogovensteen"), was built to use slag from the blast furnace to make building products, but the enterprise ceased in 1927. A third blast furnace started operation in 1930.