Information about polyisocyanate prepolymers: https://archive.epa.gov/epa/sites/production/files/2015-06/documents/toxicology_including_appendix_a_a-1_a-2_for_the_revised_draft_of_the_isocyanates_profile.pdf
Information about polyisocyanate prepolymers: West RJ, Euskirchen L, Neuhahn A, Seneker S, Spence MW. Exploring structure/property relationships to health and environmental hazards of polymeric polyisocyanate prepolymer substances-1. Design of experiments, aquatic exposure, and acute aquatic toxicity. Toxicol Ind Health. 2022 Sep;38(9):544-555. doi: 10.1177/07482337221097009. Epub 2022 May 21. PMID: 35603521. https://pubmed.ncbi.nlm.nih.gov/35603521/
Information about TDI and MDI: https://www.atsdr.cdc.gov/ToxProfiles/tp206.pdf
Rev. 24, published 5/6/2008 retrieved from the PAC Archive: https://edms3.energy.gov/pac/Archive
ERPGs: https://cameochemicals.noaa.gov/chemical/8588
Exposure data: https://www.osha.gov/chemicaldata/23