☣️ UN 1746 • CLASS 5
Bromine trifluoride
Placard: Oxidizer. 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.
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Quick details
UN 1746
Class: 5
Placard type: Oxidizer
ERG: Guide 144 (check current ERG)
Isolation: ERG 144: Initial isolation 100m in all directions. Protective action distance: 300m daytime, 800m nighttime for small spills; 800m daytime, 2.5km nighttime for large spills.
Chemical & Response Details
| Also known as | Bromine fluorideBrF3TrifluorobromineBromine(III) fluoride |
| CAS Number | 7787-71-5 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, irritating odor. Highly reactive and corrosive. Hydrolyzes violently in moist air producing dense white fumes. |
| Flash Point | Not applicable (strong oxidizer, not flammable itself) |
| Boiling Point | 127°C (261°F) |
| Vapor Density | 4.8 (much heavier than air) |
| Water Reactivity | Reacts violently and explosively with water, producing toxic and corrosive hydrogen fluoride and hydrogen bromide gases. Never use water directly. |
| Extinguishing | Dry sand, dry chemical, soda ash for small fires only. Do not use water, foam, or CO2. Let large fires burn under controlled conditions. |
| PPE | ⚠️ Level A required; full encapsulating chemical protective suit with SCBA. Material must resist hydrofluoric acid. Bromine trifluoride permeates many materials. |
| Isolation | ERG 144: Initial isolation 100m in all directions. Protective action distance: 300m daytime, 800m nighttime for small spills; 800m daytime, 2.5km nighttime for large spills. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- React vigorously and/or explosively with water.
- Produce toxic and/or corrosive substances on contact with water.
- Flammable/toxic gases may accumulate in tanks and hopper cars.
- Some may produce flammable hydrogen gas upon contact with metals.
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- TOXIC; inhalation or contact with vapor, substance, or decomposition products may cause severe injury
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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 1746 — Bromine trifluoride HAZMAT RADIO NOTE — UN 1746
Product: Bromine trifluoride
Class 5 / Oxidizer / ERG 144
PPE: Level A required; full encapsulating chemical protective suit with SCBA. Material must resist hydrofluoric acid. Bromine trifluoride permeates many materials.
ISOLATION: ERG 144: Initial isolation 100m in all directions. Protective action distance: 300m daytime, 800m nighttime for small spills; 800m daytime, 2.5km 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 1746 — Bromine trifluoride
Class: 5 | Placard: Oxidizer | ERG Guide: 144
Appearance: Colorless to pale yellow fuming liquid with a pungent, irritating odor. Highly reactive and corrosive. Hydrolyzes violently in moist air producing dense white fumes.
Water Reactivity: Reacts violently and explosively with water, producing toxic and corrosive hydrogen fluoride and hydrogen bromide gases. Never use water directly.
Extinguishing: Dry sand, dry chemical, soda ash for small fires only. Do not use water, foam, or CO2. Let large fires burn under controlled conditions.
PPE: Level A required; full encapsulating chemical protective suit with SCBA. Material must resist hydrofluoric acid. Bromine trifluoride permeates many materials.
Isolation: ERG 144: Initial isolation 100m in all directions. Protective action distance: 300m daytime, 800m nighttime for small spills; 800m daytime, 2.5km nighttime for large spills.
— Key Hazards —
• May ignite combustibles (wood, paper, oil, clothing, etc.).
• React vigorously and/or explosively with water.
• Produce toxic and/or corrosive substances on contact with water.
— 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/1746 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1746 Bromine trifluoride Cls5 ERG144 | ERG 144: Initial isolation 100m in all directions. Protective action distance: 3 | allfirefighter.com/hazmat/un/1746SMS / 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/1746
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FAQ
May ignite combustibles (wood, paper, oil, clothing, etc.). React vigorously and/or explosively with water. Produce toxic and/or corrosive substances on contact with water. Flammable/toxic gases may accumulate in tanks and hopper cars. Some may produce flammable hydrogen gas upon contact with metals. Containers may explode when heated. Runoff may create fire or explosion hazard. TOXIC; inhalation or contact with vapor, substance, or decomposition products may cause severe injury
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; full encapsulating chemical protective suit with SCBA. Material must resist hydrofluoric acid. Bromine trifluoride permeates many materials.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 144 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.