Whey Powder means the product obtained by spray or roller drying sweet whey or acid whey from which major portion of milk fat has been removed. Sweet Whey means the fluid separated from the curd after the coagulation of milk, cream, skimmed milk or buttermilk in the manufacture of cheese, casein or similar products, principally with non-animal rennet type enzymes.
Acid Whey is obtained after coagulation of milk, cream, skimmed milk or buttermilk, principally with acids of the types used for manufacture of edible acid casein, chhana, paneer, or fresh cheese. It shall be of uniform colour with pleasant taste and flavour free from off flavour and rancidity. It may contain food additives permitted in these regulation including Appendix A. It shall conform to the microbiological requirements prescribed in Appendix B. It shall conform to the following requirements:—

Requirements	Whey Powder	Acid Whey Powder
Moisture	Not more than 5.0 percent	Not more than 4.5 percent
Milk Fat	Not more than 2.0 percent m/m	Not more than 2.0 percent m/m
Milk Protein (N x 6.38)	Not less than 10.0 percent m/m	Not less than 7.0 percent m/m
Total Ash	Not more than 9.5 percent m/m	Not more than 15.0 percent m/m
pH (in 10.0% solution)	Not less than 5.1	Not more than 5.1
Lactose content expressed as anhydrous Lactose	Not less than 61.0 percent m/m	Not less than 61.0 percent m/m

Note
Although the powders may contain both anhydrous lactose and lactose monohydrates, the lactose content is expressed as anhydrous lactose
100 parts of lactose monohydrate contain 95 parts of anhydrous lactose