Quaternium‐15 sensitization in the North East of Italy, trend from 1996 to 2016 and occupational role

: Methenamine 3-chloroallylochloride (CAS 51229-78-8) or quaternium-15 , is a quaternary ammonium salt that was used as preservative in many cosmetics, liquid soaps, moisturizers, eye make-up, bath gels, shaving creams and cleaning supplies (also non-cosmetic supplies, as floor waxes and inks).