pasteurization by heating ultra high temperature (UHT) pasteurization Typically involves heating milk or cream to 135° to 150° C (275° to 302° F) for 1 or 2 seconds. The milk is then packaged in sterile, hermetically-sealed (airtight) containers (aspetic filling) and can be stored without refrigeration for up to 90 days. After opening, spoilage times for UHT products are similar to those of conventionally pasteurized products. http://www.langual.org/langual_thesaurus.asp?termid=J0180