☣️ UN 2341 • CLASS 3
1-Bromo-3-methylbutane
Placard: Flammable. 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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Quick details
UN 2341
Class: 3
Placard type: Flammable
ERG: Guide 130 (check current ERG)
Isolation: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m all directions; evacuate downwind if fire threatens
Chemical & Response Details
| Also known as | Isoamyl bromideIsopentyl bromide3-Methylbutyl bromide1-Bromo-3-methyl butane |
| CAS Number | 107-82-4 |
| Appearance | Clear to pale yellow liquid with a characteristic organic solvent odor. Denser than water and immiscible with water. |
| Flash Point | 32°C (90°F) |
| Boiling Point | 120°C (248°F) |
| Vapor Density | 5.2 (heavier than air) |
| Water Reactivity | No significant reaction; immiscible with water |
| Extinguishing | Alcohol-resistant foam, CO2, dry chemical, water spray |
| PPE | ⚠️ Level B minimum for spill response; SCBA and chemical-resistant suit; avoid skin contact and inhalation of vapors |
| Isolation | ERG 130: Small spill isolate 30m all directions; large spill isolate 150m all directions; evacuate downwind if fire threatens |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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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UN 2341 — 1-Bromo-3-methylbutane HAZMAT RADIO NOTE — UN 2341
Product: 1-Bromo-3-methylbutane
Class 3 / Flammable / ERG 130
PPE: Level B minimum for spill response; SCBA and chemical-resistant suit; avoid skin contact and inhalation of vapors
ISOLATION: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m all directions; evacuate downwind if fire threatens
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 2341 — 1-Bromo-3-methylbutane
Class: 3 | Placard: Flammable | ERG Guide: 130
Appearance: Clear to pale yellow liquid with a characteristic organic solvent odor. Denser than water and immiscible with water.
Water Reactivity: No significant reaction; immiscible with water
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray
PPE: Level B minimum for spill response; SCBA and chemical-resistant suit; avoid skin contact and inhalation of vapors
Isolation: ERG 130: Small spill isolate 30m all directions; large spill isolate 150m all directions; evacuate downwind if fire threatens
— 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/2341 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2341 1-Bromo-3-methylbutane Cls3 ERG130 | ERG 130: Small spill isolate 30m all directions; large spill isolate 150m all di | allfirefighter.com/hazmat/un/2341SMS / 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/2341
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FAQ
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 for spill response; SCBA and chemical-resistant suit; avoid skin contact and inhalation of vapors
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.