Quick freezing Rapid freezing of food by exposure to a blast of air at a very low temperature. Unlike slow freezing, very small crystals of ice are formed which do not rupture the cells of the food and so the structure is relatively undamaged.A quick‐frozen food is commonly defined as one that has been cooled from a temperature of 0 °C to −5 °C or lower, in a period of not more than 2 hours, and then cooled to −18 °C.