☣️ UN 2279 • CLASS 6
UN 2279 — Hexachlorobutadiene
Placard: Toxic. ERG Guide 151. 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 2279 Quick Details
UN 2279
Product name: Hexachlorobutadiene
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m
Common Hazards of UN 2279
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | HCBDPerchlorobutadiene1,1,2,3,4,4-Hexachloro-1,3-butadieneDolen-purGP-40-66:120 |
| CAS Number | 87-68-3 |
| Appearance | Colorless to pale yellow liquid with a mild turpentine-like odor. Insoluble in water and denser than water. |
| Flash Point | 95°C (203°F) |
| Boiling Point | 215°C (419°F) |
| Vapor Density | 9.0 (much heavier than air) |
| Water Reactivity | No significant reaction with water; insoluble and will sink |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2279
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE Requirements
⚠️ Level A recommended due to high toxicity and skin absorption hazard; SCBA and fully encapsulating suit required; avoid all skin contact
Isolation & Evacuation
ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2279 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.
- 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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📋 Copy & Share Field Card
UN 2279 — HexachlorobutadieneHAZMAT RADIO NOTE — UN 2279
Product: Hexachlorobutadiene
Class 6 / Toxic / ERG 151
PPE: Level A recommended due to high toxicity and skin absorption hazard; SCBA and fully encapsulating suit required; avoid all skin contact
ISOLATION: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 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 2279 — Hexachlorobutadiene
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Colorless to pale yellow liquid with a mild turpentine-like odor. Insoluble in water and denser than water.
Water Reactivity: No significant reaction with water; insoluble and will sink
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE: Level A recommended due to high toxicity and skin absorption hazard; SCBA and fully encapsulating suit required; avoid all skin contact
Isolation: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/2279 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2279 Hexachlorobutadiene Cls6 ERG151 | ERG 151: isolate spill/leak area immediately for at least 25-50m in all directio | allfirefighter.com/hazmat/un/2279SMS / 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/2279
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Frequently Asked Questions about UN 2279
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Containers may explode when heated. Runoff may pollute waterways.
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 recommended due to high toxicity and skin absorption hazard; SCBA and fully encapsulating suit required; avoid all skin contact
Water reactivity: No significant reaction with water; insoluble and will sink. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only.
ERG Guide 151 recommendation: ERG 151: isolate spill/leak area immediately for at least 25-50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions and consider initial evacuation 800m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.