Dangerous and potentially deadly

The Chronicle/A&M analysis considered hundreds of chemicals. Here are four used by facilities on the list of those having high potential for harm.

TRIETHYL ALUMINIUM C6H15Al

WHAT IT LOOKS LIKE: Colorless liquid. WHAT IT’S USED FOR: As a catalyst in the production of polyethylene and as a plating agent. A mixture of triethylaluminium and triethylborane is used as the ignitor for the first stage of the SpaceX Falcon 9 rocket.

WHY IT’S SCARY: Ignites immediately upon exposure to air. Contact with eyes or skin causes severe burns.

HYDRAZINE N2H4

WHAT IT LOOKS LIKE: Colorless liquid with an ammonia-like odor.

WHAT IT’S USED FOR: As a rocket propellant and in fuel cells.

WHY IT’S SCARY: Highly flammable. Also highly toxic when inhaled or absorbed by the skin. Can cause seizures or coma and damage to the liver, kidneys and central nervous system. The EPA says it’s a carcinogen.

ALUMINUM PHOSPHIDE AlP

WHAT IT LOOKS LIKE: Dark gray or yellow crystals, powder or pellets, with a garlic odor.

WHAT IT’S USED FOR: As a pesticide. Can also be used in devices such as LEDs.

WHY IT’S SCARY: When it comes into contact with atmospheric moisture or the hydrochloric acid commonly found in the stomach, it releases phosphine gas, which is deadly on contact. Especially toxic to aquatic life.

CUMENE HYDROPEROXIDE C9H12O2

WHAT IT LOOKS LIKE: Colorless or pale yellow liquid with a sharp, irritating odor.

WHAT IT’S USED FOR: In the production of polymers and fiberglass products.

WHY IT’S SCARY: A powerful oxidizing agent, it reacts violently with water. Highly flammable. Toxic if swallowed. Inhalation causes headache and burning throat. The liquid form can burn the skin or cause eye damage.