Permeate is the by-product from making milk or whey protein concentrates by ultra filtration. Permeate contains the soluble parts of the milk or whey; dairy salts and lactose. After concentrating the liquid permeate, the product is spray dried and crystallized. Proper crystallization is important for the free flowing ability of the product. Permeates are also available in demineralised versions.
Permeates have many different applications, for example in confectionary products, as a filler for food products or a carrier for seasonings.