☣️ UN 2901 • CLASS 2
UN 2901 — Bromine chloride
Placard: Toxic Gas. ERG Guide 124. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
Advertisement
UN 2901 Quick Details
UN 2901
Product name: Bromine chloride
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 124 (check current ERG)
Initial isolation: ERG 124: isolate 150m in all directions; protective action distance 0.8 km daytime, 2.3 km nighttime for large spills
Common Hazards of UN 2901
- TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin.
- Fire will produce irritating, corrosive and/or toxic gases.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Runoff from fire control or dilution water may cause environmental contamination.
- Substance does not burn but will support combustion.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- These are strong oxidizers and will react vigorously or explosively with many materials including fuels.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
Chemical Identity & Physical Properties
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2901
Extinguishing Media
Dry chemical or CO2 for small fires; water spray to reduce vapors but avoid direct contact
PPE Requirements
⚠️ Level A required for significant releases; SCBA and fully encapsulating chemical-resistant suit; extreme corrosivity to skin and respiratory system
Isolation & Evacuation
ERG 124: isolate 150m in all directions; protective action distance 0.8 km daytime, 2.3 km nighttime for large spills
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 124).
First Actions for a UN 2901 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- See Table 1 - Initial Isolation and Protective Action Distances.
Advertisement
📋 Copy & Share Field Card
UN 2901 — Bromine chlorideHAZMAT RADIO NOTE — UN 2901
Product: Bromine chloride
Class 2 / Toxic Gas / ERG 124
PPE: Level A required for significant releases; SCBA and fully encapsulating chemical-resistant suit; extreme corrosivity to skin and respiratory system
ISOLATION: ERG 124: isolate 150m in all directions; protective action distance 0.8 km daytime, 2.3 km nighttime for large spills
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 2901 — Bromine chloride
Class: 2 | Placard: Toxic Gas | ERG Guide: 124
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.
Water Reactivity: Reacts with water producing hydrobromic and hypochlorous acids; corrosive reaction
Extinguishing: Dry chemical or CO2 for small fires; water spray to reduce vapors but avoid direct contact
PPE: Level A required for significant releases; SCBA and fully encapsulating chemical-resistant suit; extreme corrosivity to skin and respiratory system
Isolation: ERG 124: isolate 150m in all directions; protective action distance 0.8 km daytime, 2.3 km nighttime for large spills
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin.
• Fire will produce irritating, corrosive and/or toxic gases.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/2901 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2901 Bromine chloride Cls2 ERG124 | ERG 124: isolate 150m in all directions; protective action distance 0.8 km dayti | allfirefighter.com/hazmat/un/2901SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/2901
Advertisement
Frequently Asked Questions about UN 2901
TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin. Fire will produce irritating, corrosive and/or toxic gases. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Runoff from fire control or dilution water may cause environmental contamination. Substance does not burn but will support combustion. Vapors from liquefied gas are initially heavier than air and spread along ground. These are strong oxidizers and will react vigorously or explosively with many materials including fuels. May ignite combustibles (wood, paper, oil, clothing, etc.).
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level A required for significant releases; SCBA and fully encapsulating chemical-resistant suit; extreme corrosivity to skin and respiratory system
Water reactivity: Reacts with water producing hydrobromic and hypochlorous acids; corrosive reaction. Recommended extinguishing: Dry chemical or CO2 for small fires; water spray to reduce vapors but avoid direct contact.
ERG Guide 124 recommendation: ERG 124: isolate 150m in all directions; protective action distance 0.8 km daytime, 2.3 km nighttime for large spills
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 124 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.