How long can I keep evaporated milk, sweetened condensed milk, and powdered milk?

These water-extracted milk products, commonly used for cooking and baking, are heat-sterilized and canned for a longer shelf life than regular milk. Evaporated milk (half the water content removed) and sweetened condensed milk (half of water content removed, then sweetened) have a shelf-life of about 1 year at room temperature. Cans are best stored in a cool, dry area and inverted every 2 months to avoid separation of water and solids, according to the National Dairy Council. Unopened, they are safe as long as the cans are intact; however, they may thicken, carmelize, and turn brown with time.
Once opened, canned milk should  be poured into a covered opaque container, refrigerated, and used within a few days. 
Cans of Nestle Carnation Evaporated Milk carry a "best before" date, and Nestle doesn’t recommend using the product beyond that date for quality reasons.  
Powdered milk (water extracted entirely) has a shelf life of 6-9 months when stored at lower than 80° F and less than 65% relative humidity. But the protein and sugars in powdered milk, whether opened or not, react over time to cause it to brown and become clumped and off-flavored.
Nonfat dry milk has a shelf life of 12-18 months under the conditions described above.
Once opened, dry milk should be stored  in an airtight container. Refrigerated reconstituted milk should be used within a few days.
National Dairy Council Factsheet: “Newer Knowledge of Dairy Foods--Protecting the Quality of Milk and Other Dairy Foods” 
Very Best (Nestle corporate website) “Commonly Asked Questions” 
Susan Brewer, Ph.D. University of Illinois, Department of Food Science and Human Nutrition


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