☣️ UN 2024 • CLASS 6
UN 2024 — Mercury compound, liquid, n.o.s.
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 2024 Quick Details
UN 2024
Product name: Mercury compound, liquid, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spill isolate 100m; downwind evacuation 300m minimum
Common Hazards of UN 2024
- 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 | Mercury compounds liquidOrganomercury liquidMercurial liquid compoundLiquid mercury derivative |
| Appearance | Variable appearance depending on specific compound; typically colorless to pale yellow liquids with characteristic metallic or chemical odor. Liquid at room temperature. |
| Flash Point | Variable depending on specific mercury compound; many are non-flammable but organic mercury compounds may have flash points ranging from 10-60C (50-140F) |
| Boiling Point | Variable depending on specific compound; typically ranges from 100-300C (212-572F) for common organomercury compounds |
| Vapor Density | Greater than 1 (heavier than air) for most mercury compound vapors |
| Water Reactivity | No significant reaction with water for most compounds, though some organomercury compounds may slowly hydrolyze |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2024
Extinguishing Media
Dry chemical, CO2, water spray for cooling; foam may be used on non-reactive compounds
PPE Requirements
⚠️ Level A required for unknown compounds; minimum Level B with SCBA; full face respirator with mercury vapor cartridges; butyl rubber or nitrile gloves; avoid all skin contact
Isolation & Evacuation
ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spill isolate 100m; downwind evacuation 300m minimum
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2024 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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UN 2024 — Mercury compound, liquid, n.o.s.HAZMAT RADIO NOTE — UN 2024
Product: Mercury compound, liquid, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A required for unknown compounds; minimum Level B with SCBA; full face respirator with mercury vapor cartridges; butyl rubber or nitrile gloves; avoid all skin contact
ISOLATION: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spill isolate 100m; downwind evacuation 300m minimum
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 2024 — Mercury compound, liquid, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific compound; typically colorless to pale yellow liquids with characteristic metallic or chemical odor. Liquid at room temperature.
Water Reactivity: No significant reaction with water for most compounds, though some organomercury compounds may slowly hydrolyze
Extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used on non-reactive compounds
PPE: Level A required for unknown compounds; minimum Level B with SCBA; full face respirator with mercury vapor cartridges; butyl rubber or nitrile gloves; avoid all skin contact
Isolation: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spill isolate 100m; downwind evacuation 300m minimum
— 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/2024 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2024 Mercury compound, liquid, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/2024SMS / 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/2024
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Frequently Asked Questions about UN 2024
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 required for unknown compounds; minimum Level B with SCBA; full face respirator with mercury vapor cartridges; butyl rubber or nitrile gloves; avoid all skin contact
Water reactivity: No significant reaction with water for most compounds, though some organomercury compounds may slowly hydrolyze. Recommended extinguishing: Dry chemical, CO2, water spray for cooling; foam may be used on non-reactive compounds.
ERG Guide 151 recommendation: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spill isolate 100m; downwind evacuation 300m minimum
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.