☣️ UN 2732 • CLASS 6
UN 2732 — Nitrobromobenzenes, liquid
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
Nitrobromobenzenes, liquid is a toxic isomer category. Responders should control vapor, skin contact and contaminated runoff until the exact product is verified.
Hazard overview: This material combines toxic nitroaromatic exposure hazards with combustible-liquid fire behavior. Heating can generate toxic brominated and nitrogen oxide fumes.
Response guidance: Isolate the area, remove ignition sources and prevent sewer entry. Use alcohol-resistant foam, dry chemical or CO2 for fire; cool exposed containers with water spray from a safe distance.
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UN 2732 Quick Details
UN 2732
Product name: Nitrobromobenzenes, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
Common Hazards of UN 2732
- Nitrobromobenzenes are highly toxic by inhalation, ingestion and skin absorption.
- Liquid or vapor contact can injure eyes, skin and respiratory tissue.
- Combustible liquid; heated vapors may form ignitable mixtures.
- Vapors are heavier than air and may travel along the ground to low areas.
- Fire can produce toxic nitrogen oxides, hydrogen bromide and irritating smoke.
- Runoff can spread toxic contamination and may pollute waterways.
- Properties vary by isomer; verify shipping papers and SDS.
Chemical Identity & Physical Properties
Yellow to brown oily liquid with a faint aromatic odor. Denser than water and may sink
| Also known as | nitrobromobenzenebromonitrobenzeneNBAbrominated nitrobenzene isomers |
| Appearance | Yellow to brown oily liquid with a faint aromatic odor. Denser than water and may sink. |
| Flash Point | 127°C (261°F) |
| Boiling Point | 256-265°C (493-509°F) depending on isomer |
| Vapor Density | 7.0 (heavier than air) |
| Water Reactivity | No significant reaction with water, but essentially insoluble |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2732
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2, water spray for cooling
PPE Requirements
⚠️ Level A or B with SCBA required; full chemical protective clothing to prevent any skin contact; highly toxic by all routes of exposure
Use SCBA and full chemical-protective clothing to prevent vapor and liquid contact; select glove material from the SDS.
Isolation & Evacuation
ERG 152: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 2732 Incident
- Call 911 and the emergency response number shown on the shipping papers.
- Keep unauthorized personnel away and deny entry to the spill or fire area.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Ventilate confined spaces only if personnel are trained, equipped and monitored.
- Use the ERG, SDS, shipping papers and air monitoring to set isolation, PPE and tactical decisions.
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📋 Copy & Share Field Card
UN 2732 — Nitrobromobenzenes, liquidHAZMAT RADIO NOTE — UN 2732
Product: Nitrobromobenzenes, liquid
Class 6 / Toxic / ERG 152
PPE: Level A or B with SCBA required; full chemical protective clothing to prevent any skin contact; highly toxic by all routes of exposure
ISOLATION: ERG 152: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
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 2732 — Nitrobromobenzenes, liquid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Yellow to brown oily liquid with a faint aromatic odor. Denser than water and may sink.
Water Reactivity: No significant reaction with water, but essentially insoluble
Extinguishing: Alcohol-resistant foam, dry chemical, CO2, water spray for cooling
PPE: Level A or B with SCBA required; full chemical protective clothing to prevent any skin contact; highly toxic by all routes of exposure
Isolation: ERG 152: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car is involved in fire, isolate 800m in all directions and consider initial evacuation for 800m
— Key Hazards —
• Nitrobromobenzenes are highly toxic by inhalation, ingestion and skin absorption.
• Liquid or vapor contact can injure eyes, skin and respiratory tissue.
• Combustible liquid; heated vapors may form ignitable mixtures.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers.
• Keep unauthorized personnel away and deny entry to the spill or fire area.
• Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
• Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
SOURCE: allfirefighter.com/hazmat/un/nitrobromobenzenes-liquid-un-2732 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2732 Nitrobromobenzenes, liquid Cls6 ERG152 | allfirefighter.com/hazmat/un/nitrobromobenzenes-liquid-un-2732SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/nitrobromobenzenes-liquid-un-2732
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Frequently Asked Questions about UN 2732
UN 2732 is Nitrobromobenzenes, liquid, regulated as a toxic combustible brominated nitroaromatic liquid for transport and emergency response.
The main concern is a toxic combustible brominated nitroaromatic liquid behavior plus exposure risk from dust, vapor, liquid or fire products.
Approach from upwind, isolate the area, keep nonessential people out and verify the exact product with shipping papers or SDS.
No violent water reaction is expected, but water can spread toxic contamination and should be contained.
Use SCBA and full chemical-protective clothing to prevent vapor and liquid contact; select glove material from the SDS.
Fire may produce toxic nitrogen oxide and hydrogen bromide fumes; downwind exposure control is important.
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.