☣️ UN 2504 • CLASS 6
Acetylene tetrabromide
Placard: Toxic. 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 2504
Class: 6
Placard type: Toxic
ERG: Guide 159 (check current ERG)
Isolation: ERG 159: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
Chemical & Response Details
| Also known as | Tetrabromoethane1,1,2,2-TetrabromoethaneTBEMuthmann's liquidSym-tetrabromoethane |
| CAS Number | 79-27-6 |
| Appearance | Colorless to pale yellow heavy liquid with a sweet, chloroform-like odor. Denser than water and practically insoluble in water. |
| Flash Point | Not applicable (non-flammable) |
| Boiling Point | 151C (304F) |
| Vapor Density | 11.6 (much heavier than air) |
| Water Reactivity | No significant reaction with water; insoluble but stable |
| Extinguishing | Dry chemical, CO2, foam, water spray for cooling containers |
| PPE | ⚠️ Level B minimum; SCBA required due to toxic vapor hazard; chemical-resistant gloves and suit essential |
| Isolation | ERG 159: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Inhalation of vapors or dust is extremely irritating.
- May cause burning of eyes and lachrymation (flow of tears).
- May cause coughing, difficult breathing and nausea.
- Brief exposure effects last only a few minutes.
- Exposure in an enclosed area may be very harmful.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some of these materials may burn, but none ignite readily.
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
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 2504 — Acetylene tetrabromide HAZMAT RADIO NOTE — UN 2504
Product: Acetylene tetrabromide
Class 6 / Toxic / ERG 159
PPE: Level B minimum; SCBA required due to toxic vapor hazard; chemical-resistant gloves and suit essential
ISOLATION: ERG 159: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
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 2504 — Acetylene tetrabromide
Class: 6 | Placard: Toxic | ERG Guide: 159
Appearance: Colorless to pale yellow heavy liquid with a sweet, chloroform-like odor. Denser than water and practically insoluble in water.
Water Reactivity: No significant reaction with water; insoluble but stable
Extinguishing: Dry chemical, CO2, foam, water spray for cooling containers
PPE: Level B minimum; SCBA required due to toxic vapor hazard; chemical-resistant gloves and suit essential
Isolation: ERG 159: isolate spill or leak area immediately for at least 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions
— Key Hazards —
• Inhalation of vapors or dust is extremely irritating.
• May cause burning of eyes and lachrymation (flow of tears).
• May cause coughing, difficult breathing and nausea.
— 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/2504 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2504 Acetylene tetrabromide Cls6 ERG159 | ERG 159: isolate spill or leak area immediately for at least 50m in all directio | allfirefighter.com/hazmat/un/2504SMS / 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/2504
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FAQ
Inhalation of vapors or dust is extremely irritating. May cause burning of eyes and lachrymation (flow of tears). May cause coughing, difficult breathing and nausea. Brief exposure effects last only a few minutes. Exposure in an enclosed area may be very harmful. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some of these materials may burn, but none ignite readily.
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; SCBA required due to toxic vapor hazard; chemical-resistant gloves and suit essential
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 159 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.