Depending on the way respective materials are handled in different processes, particles can be released from bulk materials. Being mostly undesirable, this release of particles can represent a health risk to humans and a hazard to the environment. Therefore, dust formation tendency represents an important material property and depends on the respective type of stress. Using the rotating-drum method and the single-drop method, the dust formation tendency and the influence by grinding aids is examined. The obtained results show that the dust formation tendency of bulk materials can be considerably increased by the addition of grinding aids.