Ann: Launch of Australias Own Dairy Range including A2 Protein, page-20

UHT milk is essentially pasturised at a higher temperature, leading to less microorganisms in the milk to spoil it. This is why it doesn't need to be refrigerated until it's opened (opening it allows microorganisms in, chilling it slows their growth) and lasts months on the shelf. It's the typical 'long life milk', with membrane filtering milk a more recent alternative. UHT isn't very popular in Aus, as we have easy access to domestic fresh milk and refrigeration but this could be great for the Asian markets.