In a collaborative research project "Consumer Oriented Solid Transport Technology" (COSTT) funded by the European Union caking properties were measured. Several partners from industry and academia were involved in this project. The caking properties of the selected bulk solids coming from the industrial partners strongly depend on consolidation stress, consolidation time, temperature, and humidity. The consolidation of the samples to be tested was carried out in a climatic chamber, where the rapid attainment of equilibrium regarding temperature and humidity was an essential prerequisite. For testing, the principle of an uniaxial tester was chosen.