☣️ UN 2025 • CLASS 6
Mercury compound, solid, n.o.s.
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 2025
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: isolate spill area immediately 25-50m in all directions; if fire involved, isolate 800m and consider evacuation
Chemical & Response Details
| Also known as | Mercury saltsMercuric compoundsMercurous compoundsMercury derivativesOrganomercury compounds |
| Appearance | Appearance varies by specific compound; typically white to gray or colored crystalline solids or powders, odorless or with faint metallic odor at room temperature. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (varies by specific mercury compound, many decompose before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally no significant reaction with water, though some compounds may release toxic mercury vapors or decompose |
| Extinguishing | Water spray for cooling, dry chemical or CO2 for small fires; avoid creating dust |
| PPE | ⚠️ Level A or B with SCBA required; full face protection, chemical-resistant suit and gloves mandatory; prevent any skin contact |
| Isolation | ERG 151: isolate spill area immediately 25-50m in all directions; if fire involved, isolate 800m and consider evacuation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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.
- 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 2025 — Mercury compound, solid, n.o.s. HAZMAT RADIO NOTE — UN 2025
Product: Mercury compound, solid, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A or B with SCBA required; full face protection, chemical-resistant suit and gloves mandatory; prevent any skin contact
ISOLATION: ERG 151: isolate spill area immediately 25-50m in all directions; if fire involved, isolate 800m and consider evacuation
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 2025 — Mercury compound, solid, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Appearance varies by specific compound; typically white to gray or colored crystalline solids or powders, odorless or with faint metallic odor at room temperature.
Water Reactivity: Generally no significant reaction with water, though some compounds may release toxic mercury vapors or decompose
Extinguishing: Water spray for cooling, dry chemical or CO2 for small fires; avoid creating dust
PPE: Level A or B with SCBA required; full face protection, chemical-resistant suit and gloves mandatory; prevent any skin contact
Isolation: ERG 151: isolate spill area immediately 25-50m in all directions; if fire involved, isolate 800m and consider evacuation
— 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/2025 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2025 Mercury compound, solid, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/2025SMS / 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/2025
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FAQ
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 or B with SCBA required; full face protection, chemical-resistant suit and gloves mandatory; prevent any skin contact
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.