 The impact of the economic crisis of 1929 almost brought the production to a halt.Only the operation at Grottau, now Czechoslovakian, was fully booked

In 1933 the Berlin operation, in collaboration with the IG-Farben (Leverkusen) test laboratories, succeeded in introducing the synthetic rubber "Buna" for practical manufacture.The first innovation of the new material was the use in brake hoses for the German National Railway (Deutsche Reichsbahn)

The threatening danger of a second world war moved the board of directors to abandon business activities in east-Europe.