Improving Rolling-Mill Lube-Oil Performance And Useful Life
One blender defines the maximum suitable water level as 500 ppm (0.05%) to ensure optimum lubrication, viscosity and useful oil life. In the field, it's not unusual to encounter rolling-mill oils that look like chocolate milk or mud (cloudy), with water levels from 3000 ppm (0.3%) up to 150,000 ppm (15%).