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How long can unopened UHT milk be stored?
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food preservation
An overview of food preservation.
Unopened ultrahigh-temperature (UHT) pasteurization milk can typically be stored without refrigeration for a period ranging from six months to one year.123
This extended shelf life is achieved by heating the milk to 138–150 °C (280–302 °F) for one or two seconds and subsequently packaging it in sterile, hermetically sealed containers, such as metal cans or five-layer laminated boxes. Once the container is opened, however, the milk must be treated like conventionally pasteurized products and will have a much shorter shelf life.123