Does UHT milk when packaged in Tetra packs have any preservatives to maintain a shelf life of approx 6 months?

No, UHT milk in Tetra Paks does not contain any preservatives to maintain its shelf life of approximately 6 months. Instead, it undergoes a process called ultra-high temperature (UHT) treatment, which involves heating the milk to a very high temperature (usually between 135°C and 150°C) for a very short period (usually 2-5 seconds). This treatment kills almost all spoilage-causing microorganisms and enzymes present in the milk, making it commercially sterile.

The sterility achieved through UHT processing, coupled with the airtight and light-blocking properties of Tetra Paks, helps preserve the quality and freshness of the milk for an extended period without the need for added preservatives. Tetra Paks also prevent the entry of oxygen, moisture, and light, which can compromise the quality and shelf life of the milk.

Therefore, UHT treatment and the use of Tetra Paks work together to ensure the extended shelf life of UHT milk without the addition of preservatives.