https://thefooduntold.com/food-science/what-is-flash-pasteurization/

Generally, pasteurization involves heating packaged or non-packaged with mild heat of less than 212°F (100°C). However, pasteurization comes in several types today. And one of them is flash pasteurization, also called high-temperature short time (HTST) pasteurization. In the United states, HTST is the most common method used, especially for milk.