It is difficult to meet the regulatory, scientific, and communicative requirements together. By limiting the size (smaller than 5 mm) and restricting it to special plastics or areas of application, a limit is drawn that may unjustifiably include or exclude problem areas. Our mission: A definition of microplastics should be based on environmental impact. More detailed information can be found in our study on "Microplastics in cosmetics". A classification of the origin also helps when allocating responsibility. Depending on the source, this lies more with the producer or the consumer.