☣️ UN 2777 • CLASS 6
UN 2777 — Mercury based pesticide, solid, poisonous
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 2777 Quick Details
UN 2777
Product name: Mercury based pesticide, solid, poisonous
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill area 25m in all directions; if large spill isolate 50m; evacuate immediate area and keep unauthorized persons away
Common Hazards of UN 2777
- 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 pesticideMercurial pesticideOrganomercury pesticideMercury compound pesticide |
| Appearance | Solid material, varies in color depending on specific mercury compound (white, gray, or colored powder/granules), may have slight metallic or chemical odor. |
| Flash Point | Not applicable (non-flammable solid, though may burn under fire conditions) |
| Boiling Point | Not applicable (solid, decomposes upon heating) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | No violent reaction with water, but may release toxic mercury compounds; avoid runoff contamination |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2777
Extinguishing Media
Dry chemical, CO2, water spray for cooling; avoid dispersing material with high pressure water
PPE Requirements
⚠️ Level A or B required; full encapsulating suit, SCBA mandatory; avoid any skin contact; use chemical-resistant gloves (butyl rubber)
Isolation & Evacuation
ERG 151: isolate spill area 25m in all directions; if large spill isolate 50m; evacuate immediate area and keep unauthorized persons away
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2777 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 2777 — Mercury based pesticide, solid, poisonouHAZMAT RADIO NOTE — UN 2777
Product: Mercury based pesticide, solid, poisonous
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full encapsulating suit, SCBA mandatory; avoid any skin contact; use chemical-resistant gloves (butyl rubber)
ISOLATION: ERG 151: isolate spill area 25m in all directions; if large spill isolate 50m; evacuate immediate area and keep unauthorized persons away
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 2777 — Mercury based pesticide, solid, poisonous
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Solid material, varies in color depending on specific mercury compound (white, gray, or colored powder/granules), may have slight metallic or chemical odor.
Water Reactivity: No violent reaction with water, but may release toxic mercury compounds; avoid runoff contamination
Extinguishing: Dry chemical, CO2, water spray for cooling; avoid dispersing material with high pressure water
PPE: Level A or B required; full encapsulating suit, SCBA mandatory; avoid any skin contact; use chemical-resistant gloves (butyl rubber)
Isolation: ERG 151: isolate spill area 25m in all directions; if large spill isolate 50m; evacuate immediate area and keep unauthorized persons away
— 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/2777 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2777 Mercury based pesticide, solid, poisonous Cls6 ERG151 | allfirefighter.com/hazmat/un/2777SMS / 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/2777
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Frequently Asked Questions about UN 2777
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 required; full encapsulating suit, SCBA mandatory; avoid any skin contact; use chemical-resistant gloves (butyl rubber)
Water reactivity: No violent reaction with water, but may release toxic mercury compounds; avoid runoff contamination. Recommended extinguishing: Dry chemical, CO2, water spray for cooling; avoid dispersing material with high pressure water.
ERG Guide 151 recommendation: ERG 151: isolate spill area 25m in all directions; if large spill isolate 50m; evacuate immediate area and keep unauthorized persons away
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.