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 At a Glance
UN 2901 (Bromine chloride) is listed as DOT Class 2 Toxic Gas and is assigned to ERG Guide 124. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
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.