☣️ UN 3012 • CLASS 6
UN 3012 — Mercury based pesticide, liquid, 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 3012 Quick Details
UN 3012
Product name: Mercury based pesticide, liquid, poisonous
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
Common Hazards of UN 3012
- 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 pesticideOrganomercury pesticideMercurial pesticideMercury fungicide |
| Appearance | Liquid formulation, color varies by product (often clear to amber), may have chemical or solvent odor, room temperature liquid. |
| Flash Point | Varies by formulation, typically 23-61C (73-142F) depending on solvent base |
| Boiling Point | Varies by formulation, typically above 100C (212F) |
| Vapor Density | Heavier than air (typically 2-5 relative to air) |
| Water Reactivity | No significant reaction with water, but mercury compounds may leach |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3012
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2 appropriate for solvent fires
PPE Requirements
⚠️ Level A or B required; full face SCBA mandatory; chemical-resistant suit; avoid all skin contact; mercury vapor hazard
Isolation & Evacuation
ERG 151: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3012 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 3012 — Mercury based pesticide, liquid, poisonoHAZMAT RADIO NOTE — UN 3012
Product: Mercury based pesticide, liquid, poisonous
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full face SCBA mandatory; chemical-resistant suit; avoid all skin contact; mercury vapor hazard
ISOLATION: ERG 151: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m 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 3012 — Mercury based pesticide, liquid, poisonous
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Liquid formulation, color varies by product (often clear to amber), may have chemical or solvent odor, room temperature liquid.
Water Reactivity: No significant reaction with water, but mercury compounds may leach
Extinguishing: Alcohol-resistant foam, dry chemical, CO2 appropriate for solvent fires
PPE: Level A or B required; full face SCBA mandatory; chemical-resistant suit; avoid all skin contact; mercury vapor hazard
Isolation: ERG 151: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
— 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/3012 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3012 Mercury based pesticide, liquid, poisonous Cls6 ERG151 | allfirefighter.com/hazmat/un/3012SMS / 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/3012
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Frequently Asked Questions about UN 3012
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 face SCBA mandatory; chemical-resistant suit; avoid all skin contact; mercury vapor hazard
Water reactivity: No significant reaction with water, but mercury compounds may leach. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2 appropriate for solvent fires.
ERG Guide 151 recommendation: ERG 151: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
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.