☣️ UN 1126 • CLASS 3
UN 1126 — n-Butyl bromide
Placard: Flammable. ERG Guide 130. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ 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.
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UN 1126 Quick Details
UN 1126
Product name: n-Butyl bromide
DOT Class: 3
Placard type: Flammable
ERG Guide: 130 (check current ERG)
Initial isolation: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m, downwind evacuation 300m
Common Hazards of UN 1126
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
- Vapors may travel to source of ignition and flash back.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapor explosion hazard indoors, outdoors or in sewers.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Runoff to sewer may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| Also known as | 1-bromobutanebutyl bromiden-bromobutanebromobutane |
| CAS Number | 109-65-9 |
| Appearance | Colorless to pale yellow liquid with a characteristic sweet odor. Volatile and heavier than water. |
| Flash Point | 18°C (64°F) |
| Boiling Point | 101°C (214°F) |
| Vapor Density | 4.7 (heavier than air) |
| Water Reactivity | Insoluble in water; no significant reaction under normal conditions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1126
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level B minimum with SCBA; chemical-resistant suit for large spills or confined spaces
Isolation & Evacuation
ERG 130: Small spill isolate 30m all directions; large spill isolate 150m, downwind evacuation 300m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 130).
First Actions for a UN 1126 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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 50 meters (150 feet) in all directions.
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
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📋 Copy & Share Field Card
UN 1126 — n-Butyl bromideHAZMAT RADIO NOTE — UN 1126
Product: n-Butyl bromide
Class 3 / Flammable / ERG 130
PPE: Level B minimum with SCBA; chemical-resistant suit for large spills or confined spaces
ISOLATION: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m, downwind evacuation 300m
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 1126 — n-Butyl bromide
Class: 3 | Placard: Flammable | ERG Guide: 130
Appearance: Colorless to pale yellow liquid with a characteristic sweet odor. Volatile and heavier than water.
Water Reactivity: Insoluble in water; no significant reaction under normal conditions
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum with SCBA; chemical-resistant suit for large spills or confined spaces
Isolation: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m, downwind evacuation 300m
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
• Vapors may travel to source of ignition and flash back.
— 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/1126 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1126 n-Butyl bromide Cls3 ERG130 | ERG 130: Small spill isolate 30m all directions; large spill isolate 150m, downw | allfirefighter.com/hazmat/un/1126SMS / 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/1126
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Frequently Asked Questions about UN 1126
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated.
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 B minimum with SCBA; chemical-resistant suit for large spills or confined spaces
Water reactivity: Insoluble in water; no significant reaction under normal conditions. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling.
ERG Guide 130 recommendation: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m, downwind evacuation 300m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 130 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.