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What is the process by preserving milk by heating?
Pasteurization or ultrapasteurization (depending on temperature and time).
Why is milk subjected to pasteurization rather than sterilization?
Standard pasteurization does not heat the milk to a high enough temperature to completely kill all possible strains of bacteria and their spores that might be in it. To suppress the growth of these residual bacteria (if they are present) the milk must be refrigerated. However even refrigerated it should be completely consumed within 2 weeks of processing!A different method called flash ultrapasteurization heats the milk to a much higher temperature than is used in standard pasteurization, but for a much shorter time to prevent damaging the milk itself does kill all possible bacterial spores that might be in it. Such milk can be stored unrefrigerated in sterile containers for up to 9 months.
Does milk tea need to be refrigerated?
Short answer: No. It really depends on how the milk in the milk tea was pasteurized. Grade A pasteurization of milk in the United States can last several days if it hasn't been opened. Milk pasteurized in other areas may be done differently, such as ultrapasteurization, which extends the shelf like even longer. But generally speaking, milk tea sold in bottles and sealed should last without refrigeration for several days. It has to because the bottles stand the chance of not being refrigerated during shipping. However, once the seal has been broken, then it needs refrigeration.
