Up until 1910 – 1920 Iittala glassworks produced glass wares using imported moulds resulting in products being very similar within Finland and abroad.
In time the entire ownership of Iittala stock went to the Ahlström Group.
Iittala has strong design roots in glasswares and art glass which can be seen in, for example, the early designs of Aino Aalto glasses designed by Aino Aalto in 1932; Alvar Aalto’s Savoy Vase (Aalto Vase) from 1936; Oiva Toikka’s Birds by Toikka glass birds collection that has been made since 1962, his glassware set Kastehelmi from 1964 and Tapio Wirkkala’s glasses Ultima Thule from 1968.
Over time, Iittala has expanded from glass to other materials, such as ceramics and metal while keeping with their key philosophy of progressive elegant and timeless design, such as Kaj Franck’s Teema ceramic tableware from 1952 and Timo Sarpaneva’s cast iron pot Sarpaneva from 1960.
In 1903 Gustafsson created the glass series Great Men to passively protest Russian rule.
In 1917 due to the First World War raw materials began to become difficult to obtain, inflation caused prices to rise and wages soared resulting in Norstedt giving up the Iittala glassworks. Ahlström Group (a timber refinery) bought the Iittala glassworks and Norstedt resigned from the board in March 1917.
It was during his tenure that the Iittala glassworks enjoyed its first boom.
In 1898 a second directly fired glass furnace with five crucibles had to be built to meet demand.
Ahlström officially divided the production of Karhula-Iittala products in 1937.After the taking over of the Viiala glassworks by Karhula Oy and Riihimäen Lasi Oy a separate furnace for blowing electric lamps was built, since the employees, as part of the deal went to the Iittala glassworks.During the Winter War and the Continuation War, part of the Second World War, production came to a halt due to shortages of materials and workforce.Due to the lack of skilled glassblowers in Finland the first 17 glassblowers came from the Limmared glassworks in Sweden.They along with the local Swedish glassblower Johan Fredrik Gauffin, who was part owner, made the first glass objects on November 24, 1881.