Non natural casings exist in all possible shapes and sizes and different materials and properties. They are often made of cellulose or plastic. They can be both closed or semi-permeable, can be manufactured in many colors and in some cases have even been pre-smoked. They are often used for cooked sausages, liver sausage and black pudding. The semi-permeable types are also suitable for drying sausages and even smoking. They are not edible.
Advantages of artificial casings:
- can be used immediately, no need for desalting
- large number of calibers available
- no need to be refrigerated or stored on salt
- keep indefinately
- widely applicable
- relatively cheap