Mills are part of many production lines. They disintegrate or grind coarse materials to fine-grained or even powdery intermediate or end products. Due to the mechanical production processes, there is a permanent risk that sparks or overheating is generated that can cause fire or dust explosions.

Mills hold various risks of fire. When the fast-running machine is defective, it can generate sparks or overheating which, due to the dusty environment, can quickly lead to an explosion or a fire in the mill or adjacent plant areas. Even the fans of the extraction system can generate sparks, which is why they also represent a high risk of fire and explosion. The highest risk involved, however, undesired foreign bodies within the product, such as metal pieces or stones, which will almost certainly generate ignition sources.