FSSAI regulations define skim milk as having very little fat left in it, capping fat content at not more than 0.5 percent, since almost all the fat has been removed during processing. When this skim milk is then evaporated to concentrate it, the solids-not-fat, or SNF, rises accordingly, and the regulation requires evaporated skim milk to carry a minimum SNF of 20 percent. Matching these two figures together, the fat and SNF content for evaporated skim milk under FSSAI comes to 0.5 and 20.