UN 2901 — Bromine chloride
Placard: Toxic Gas. ERG Guide 124. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2901 is Bromine chloride, a toxic corrosive oxidizing gas assigned to ERG Guide 124. Inhalation, acid formation and cylinder hazards are critical.
Hazard overview: TOXIC, CORROSIVE and OXIDIZING liquefied gas; inhalation may be fatal. Gas or liquefied gas contact can cause severe chemical burns and frostbite. Strong oxidizer: may ignite combustibles and react violently with fuels or reducing agents.
Response guidance: For UN 2901, isolate downwind/low areas, use SCBA with chemical protection and control water contact/runoff. Cool containers from protection and follow SDS and ERG 124.
Firefighter training notes: Training for UN 2901 should emphasize exposure routes, SCBA use, vapor/dust monitoring, decontamination, runoff containment and SDS/package verification. Use ERG 124, SDS and local SOP.
Regulatory context: Bromine chloride is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on package type, quantity, formulation and jurisdiction; verify shipping papers, SDS or authority guidance.
Storage & handling: Bromine chloride should be stored in compatible corrosion-resistant containers/cylinders, segregated from water, moisture, fuels, reducing agents and unauthorized access, with ventilation and emergency planning.
UN 2901 Quick Details
Common Hazards of UN 2901
- TOXIC, CORROSIVE and OXIDIZING liquefied gas; inhalation may be fatal.
- Gas or liquefied gas contact can cause severe chemical burns and frostbite.
- Strong oxidizer: may ignite combustibles and react violently with fuels or reducing agents.
- Vapors are heavier than air and may spread along the ground into low areas.
- Water or moisture can form hydrobromic, hydrochloric or hypochlorous acid mixtures.
- Cylinders exposed to fire may vent, rupture or rocket.
- Runoff or vapor-control water may be acidic, toxic and corrosive.
Chemical Identity & Physical Properties
Reddish-brown gas or fuming liquid with a pungent, irritating odor. Exists as a gas at room temperature but may be shipped as a liquefied compressed gas.
| Also known as | Bromine monochlorideBrClChlorine bromide |
| CAS Number | 13863-41-7 |
| Appearance | Reddish-brown gas or fuming liquid with a pungent, irritating odor. Exists as a gas at room temperature but may be shipped as a liquefied compressed gas. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | 5C (41F) |
| Vapor Density | 4.0 (heavier than air) |
| Water Reactivity | Reacts with water producing hydrobromic and hypochlorous acids; corrosive reaction |
Fireground Response Guidance — UN 2901
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and fully encapsulating chemical protective clothing for significant releases. Protect against toxic corrosive gas, oxidizer exposure and frostbite.
Isolation & Evacuation
First Actions for a UN 2901 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Avoid breathing vapor, dust, gas, mist, smoke or aerosols and avoid skin or eye contact.
- Keep water or moisture contact controlled because toxic/corrosive acids or fumes may form.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 124, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2901 — Bromine chlorideUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.