Diisocyanates play an important role in the application of PUR hot melt adhesives, but they have to be handled correctly to avoid a negative impact on health [...] polyurethane, which can be found in foams, mattresses, lacquers, plastics and adhesives. The finished end product is completely harmless, but the emissions of the [...] or the air we breathe, where they have a toxic effect. This can result in contact allergies, mucous membrane irritations or even chronic respiratory diseases
https://www.jowat.com/fr-CA/detail-de-la-salle-de-presse/schools-out-for-the-mr-class/