Nanoparticles are among the most innovative materials of our time and hence they are increasingly used in all areas of life. They are defined as chemical substances or materials which correspond in at least one dimension to a particle size of 1 to 100 nanometers (nm). We support our customers in the development of environmentally friendly products (safer-by-design). Therefore, we are expanding the classical ecotoxicity tests with modified test designs and -methods. A substantial improvement compared to the classical approach in standard tests is a detailed qunatification und characterization of the nanoparticles. We also advise our customers during development, as well as during registration and admission of their products.