The CAS number is a number attributed by the Chemical Abstracts Service, a division of American Chemical Society. This number is used to indicate a chemical substance.

If you click the CAS number that follows some agents' name, it will bring you to this site : Le Répertoire toxicologique de la Commission des normes, de l'équité, de la santé et de la sécurité du travail (CNESST). You will get to the information on the chemical substance corresponding to this agent. To consult the information on sensitization, go to «Propriétés toxicologiques» section.