Meat to be frozen must be well aged. Freezing in tunnel freezer or air blast room at -10 to -40 0C . Pork contains high fat take long time, therefore, -30 to -40 0C is preferred. Freezing time for big carcass is 18-24 hr. Freezing wrapped meat, the package should be vacuum to avoid air insulation (tight-fitting packaging). Package should prevent O2 transmission to prevent lipid oxidation.