Five Hazardous Characteristics:
(1) Acute (Immediate) Health Hazard: Includes corrosive, highly toxic, irritant, sensitizer, toxic, and other hazardous chemicals which cause an adverse effect to a target organ (as defined under 1910.1200 of Title 29 of the Code of Federal Regulations) and manifests itself within a short period of time following a one-time, high exposure to the substance.
"Corrosive" means a chemical that causes visible destruction of, or irreversible alterations in, living tissue by chemical action at the site of contact.
"Highly toxic" means a chemical falling within any of the following categories:
- A chemical that has a median lethal dose (LD50) of 50 milligrams or less
- A chemical that has a median lethal dose (LD50) of 200 milligrams or less
- A chemical that has a median lethal concentration (LC50) in air of 200 parts per million by volume or less
"Irritant" means a chemical which causes a reversible inflammation at the site of contact.