How does ultrahigh-temperature processing allow milk to be stored without refrigeration before opening?

Ultrahigh-temperature (UHT) processing allows milk to be stored without refrigeration because it utilizes extreme heat to destroy microorganisms that cause spoilage. During this process, milk or cream is heated to 138–150 °C (280–302 °F) for one to two seconds.12

To maintain this shelf-stable state, the milk must be packaged in sterile, hermetically sealed containers, such as metal cans or specialized five-layer laminated boxes. By combining this intense heat treatment with aseptic packaging, the product is protected from recontamination, allowing it to be stored at room temperature for six to nine months. This differs from standard pasteurization, which leaves some harmless bacteria and requires continuous refrigeration to prevent spoilage.231

Would you like to know more about how other food preservation techniques compare to UHT processing?