Castrol Hysol MB 50 is a high performance soluble metal working fluid recommended for maching all grades of aluminum as well as ferrous alloys. Provides the performance of heavy duty soluble oils without the unpleasant shop environments and high usage rates of traditional fluids. Hysol MB 50 is chlorine, sulfur and formaldehyde releasing agent free. Its performance can exceed products which contain extreme pressure additives. Provides extended system life and product stability.