Question: what is the difference between ultra pasteurized and pasteurized milk?
Answer: HTST pasteurization heats the milk to 161 degrees Fahrenheit for 15 seconds and then rapidly cools it to 39 degrees. For UHT, raw milk is heated to approximately 280 degrees Fahrenheit for just 2 seconds and is then rapidly chilled back to 39 degrees. Both methods result in milk that is 99.9% free of bacteria.