Certified soil-biodegradable mulch films pass comprehensive ecotoxicity testing and strict thresholds concerning other harmful substances. The required testing includes plant growth test, acute or chronic earthworm test, and nitrification inhibition testing. These tests are performed on partially or completely biodegraded materials, therefore covering also the impact of degradation products, such as e.g. fragments. Additionally, there are strict rules when it comes to the usage of regulated metals, SVHCs, and PFAS.