A biopolymer-based food casing having an impregnation on the side facing the food is provided. The impregnation includes at least one hydrophobic, synthetic, organic polymer. By taloring the impregnation, the peelability of the casing may be adjusted to correspond to the type of food contained within the casing. The casing is used, especially, as an artificial sausage casing for raw sausage, scalded-emulsion sausage or cooked-meat sausage.