What do we call chemicals that can cause allergic reactions in a proportion of exposed individuals upon repeated exposure?

The term used to describe chemicals that can cause allergic reactions in individuals upon repeated exposure is "sensitizers." These substances may not trigger an immediate reaction during the first exposure but can lead to an immune response after subsequent exposures. This can result in various allergic symptoms, such as skin rashes or respiratory issues, which may range from mild to severe, depending on the individual’s sensitivity and the frequency of exposure.

Corrosives refer to substances that can cause visible destruction of living tissue or severe corrosion of material upon contact, but they are not specifically linked to allergic reactions. Hazardous agents is a broad term that encompasses a wide variety of substances that can pose risks, including toxic, corrosive, and flammable materials, but does not specifically denote the allergy-related aspect like sensitizers do. Carcinogens are substances that are capable of causing cancer, and while they pose serious health risks, their effect is not primarily characterized by allergy development through repeated exposure like sensitizers.