Dibromotetrafluoroethane (1,2-Dibromo-1,1,2,2-tetrafluoroethane)

Older/legacy halon fire systems (aviation, military, data centers), storage “halon banks,” and some obsolete refrigeration uses [2][3].

Breathing vapors during leaks, maintenance, or discharge—especially in enclosed or poorly ventilated spaces; skin/eye contact with the cold liquid [1][2].

Short-term exposure can cause dizziness, headache, confusion; it can sensitize the heart to adrenaline and trigger irregular heartbeat or cardiac arrest; very high levels can displace oxygen (asphyxiation). When heated in a fire, it can form highly corrosive gases like hydrogen fluoride and hydrogen bromide [1][2].

Firefighters; aircraft/industrial maintenance staff; workers who service or store halon; anyone in small, enclosed spaces; people with heart or respiratory conditions [1][2].

Replace halon systems where feasible; ensure leak checks, ventilation, and gas/oxygen monitors; evacuate during any discharge; use PPE and follow safety procedures; recover/dispose via certified programs [2][3].