Contain cola cans of BPA

Metal packaging

Metal, primarily tinplate and aluminum, is primarily used for beverage and food cans as well as for glass lids. Most of the tinplate produced in Germany is used to manufacture packaging.

Aluminum, on the other hand, is not only used as a can, but also in the form of foils, tubes, menu and grill trays. However, under the influence of acid or salt, aluminum components can migrate into the food. This is why packaging such as beverage cans, yoghurt cup lids or aluminum tanks for fruit juices are coated on the inside.


The metals are characterized by good barrier properties against gases, light and odors as well as by high strength.Canned foods have the longest shelf life of any packaged food. Because the contents can be pasteurized or sterilized by heat after the can is closed. In addition, metal packaging has the highest recycling rate under all packaging.


If food has been stored for many years, cans must be placed in front corrosion to be protected. This is to prevent metals from loosening and being transferred to the contents. Discoloration and taste impairment would be the result. Corrosion can also lead to leaks and even bulges.

That is why the inner surface of the can is now completely or partially sealed with a thin film made of epoxy plastic. However, this usually contains Bisphenol-A (BPA)that can migrate into the food, especially during the sterilization process. It can be harmful to people's endocrine systems and affect fertility.

A high fat or acid content in the food often intensifies the BPA migration. With the EU Regulation 2018/213, a specific migration limit (SML) of 0.05 mg BPA per kg of food applies to paints and coatings that come into contact with food.

For materials that come into contact with baby food, the transfer of BPA is not permitted or the detection limit applies (detection limit = 0.01 mg / kg). BPA-free coating systems are currently only available to a limited extent and some of them still require a health assessment.

At the beginning of January 2015, the European Food Safety Authority announced a new limit value for the intake of bisphenol A. The safe daily intake was reduced from 50 micrograms per kilogram of body weight to four micrograms per kilogram of body weight.