The main application of the ecoinvent database is life cycle assessment (LCA), a key instrument that can be used for assessing and comparing the environmental sustainability of chemicals . LCA quantifies the environmental impacts of chemical products and processes along their supply chains. An integral step this method is compiling the life cycle inventories (LCI), the sum of inputs and outputs for each process across the entire life cycle (i.e. technical inputs and outputs as well as emissions and resource consumption). Such data is the basis for the life cycle impact assessment (LCIA), in which impacts on climate change, toxicity and further impact categories are quantified . Due to the intertwined nature of the chemical sector, poor-quality data for one chemical product may severely affect the data and thus the sustainability scores of all downstream chemical products and processes that build on this product. Hence, the errors caused by poor-quality data will penetrate and potentially accumulate along the supply chains. Therefore, robust data of chemicals is a prerequisite for deriving sound conclusions and providing reliable decision support.