Seven out of 10 European milk drinkers choose it over regular milk, but shelf-stable milk is relatively new to the United States. And some consumers find it a little strange.
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There is no irradiation or chemicals in shelf-stable milk, and there is only one simple difference with refrigerated milk. When refrigerated milk is pasteurized, it is heated to 170 degrees Fahrenheit to kill bacteria.
Shelf-stable milk, on the other hand, is heated to 284 degrees, killing even more of the bacteria that cause milk to spoil.
Although shelf-stable milk is good for several months unopened, once you open it, it becomes just like regular milk. It goes right into the refrigerator, where it is good for about 10 days.
http://www.cnn.com/FOOD/resources/food.for.thought/dairy/long.life.milk/