* Respiratory sensitizers cause breathing hypersensitivity when the substance is inhaled.
* A substance which is a skin sensitizer causes an allergic response from a dermal application.
* Carcinogens induce cancer, or increase the likelihood of cancer occurring.
*Neurotoxicity is a form of toxicity in which a biological, chemical, or physical agent produces an adverse effect on the structure or function of the central and/or peripheral nervous system. It occurs when exposure to a substance – specifically, a neurotoxin or neurotoxicant– alters the normal activity of the nervous system in such a way as to cause permanent or reversible damage to nervous tissue. 
* Reproductively toxic substances cause adverse effects in either sexual function or fertility to either a parent or the offspring.
* Specific-target organ toxins damage only specific organs.
* Aspiration hazards are solids or liquids which can cause damage through inhalation.