The chemistry methodology in the Higg MSI assesses chemistry on a process level. The methodology is a semi-quantitative one, where USEtox impact results are input but are further modified to account for process and inventory uncertainty. Essentially, a logarithmic normalization of the USEtox ecotoxicity LCIA results is used for a process to reduce variability. Then, those results are grouped into high, medium, or low. Additionally, if chemistry-related certification is used at a facility or for a particular material, it may be applied in the Higg MSI to improve the score. Read further detail in the MSI methodology document on page 47.
Found an error or think something is missing? Let us know so we can enhance this article. Your feedback is valuable to us!