Ultra-high temperature processing
Ultra-high temperature, or UHT, processing is the partial sterilization of
food by heating it for a short time at a temperature significantly above 100°C, typically 135-140°C. The high temperature reduces the processing time, which reduces the danger of spoiling. The commonest UHT product is
milk, but the process is also used for fruit juices, cream, yoghurt, wine, soups and stews. UHT milk has a shelf life of six to nine months, until opened. Many people believe that UHT products are inferior in quality to less-aggressively-pasteurized alternatives, but this is disputed by the manufacturers.