Zinc stearate is widely used for the lubrication of aluminum cold extrusion processes to prevent adhesion and to reduce tool wear. It is a powder that has to be applied on the slugs by a tumbling process and leads to strong dust formation. Furthermore, it can cause respiratory irritation. This paper presents the development of a new lubricant for the cold extrusion of aluminum parts based on renewable raw materials. The new lubricant is free of zinc or other metals. Because it is a water-based suspension, it can be applied easily and without any dust formation. 

Asiatrib-2018, pp. 46-47