☣️ 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.

🚒☣️
⚠️ Verification required: Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.

Mercury based pesticide, solid, poisonous is a variable toxic pesticide solid. Appearance, active ingredient and concentration can differ, so SDS and shipping papers drive final response decisions.

Hazard overview: Mercury based pesticide may be highly toxic by inhalation, ingestion or skin absorption. Liquid or dust contact can irritate or burn skin and eyes depending on the formulation. Fire or heating may produce irritating, toxic and corrosive decomposition products.

Response guidance: For a Mercury based pesticide, solid, poisonous release, isolate the area, remove ignition sources if present, and keep runoff out of drains. Responders should use SCBA with chemical-resistant clothing and base tactics on SDS, shipping papers and monitoring.

Firefighter training notes: Train responders to identify the UN number, product name, placard, container type and exposure route before committing personnel to the hot zone.

Regulatory context: Use the proper DOT shipping description, ERG guide, SDS and site-specific response plan; do not substitute this summary for regulatory compliance.

Storage & handling: Store in sealed containers away from food/feed, incompatible chemicals, drains, heat and moisture; prevent dust release.

Advertisement

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: Use the ERG guide initial isolation distance and increase for large spills, fire, dust release, drainage paths or downwind exposure.

Common Hazards of UN 2777

  • Mercury based pesticide may be highly toxic by inhalation, ingestion or skin absorption.
  • Liquid or dust contact can irritate or burn skin and eyes depending on the formulation.
  • Fire or heating may produce irritating, toxic and corrosive decomposition products.
  • Runoff, wash water and contaminated absorbent can carry pesticide into drains or waterways.
  • Exact active ingredient, solvent carrier and concentration must be verified from SDS and shipping papers.
  • The product may not burn readily, but packaging or contaminated material can burn in a fire.
  • Dust or residues should not be dispersed during cleanup.
  • Containers may rupture when heated.

Chemical Identity & Physical Properties

Solid material, varies in color depending on specific mercury compound (white, gray, or colored powder/granules), may have slight metallic or chemical odor.

Also known asMercury pesticideMercurial pesticideOrganomercury pesticideMercury compound pesticide
AppearanceSolid material, varies in color depending on specific mercury compound (white, gray, or colored powder/granules), may have slight metallic or chemical odor.
Flash PointNot applicable (non-flammable solid, though may burn under fire conditions)
Boiling PointNot applicable (solid, decomposes upon heating)
Vapor DensityNot applicable (solid material)
Water ReactivityNo violent water reaction is expected, but wetting can create toxic runoff or slurry; keep material out of drains.
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 or foam may be used for surrounding fires; avoid dispersing dust or contaminated runoff.

PPE Requirements

⚠️ SCBA with chemical-resistant suit and gloves; Level A or B may be needed for dust, vapor, unknown concentration or skin-absorption risk.

Level A or B required; full encapsulating suit, SCBA mandatory; avoid any skin contact; use chemical-resistant gloves (butyl rubber)

Isolation & Evacuation

Use the ERG guide initial isolation distance and increase for large spills, fire, dust release, drainage paths or downwind exposure.
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 and the emergency response number shown on the shipping papers.
  • Keep unauthorized personnel away and establish an initial isolation perimeter.
  • Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
  • Avoid breathing vapors, dust, mist or smoke and prevent skin and eye contact.
  • Do not touch damaged packages, leaking containers or spilled material without appropriate PPE.
  • Ventilate confined spaces only when responders are trained, equipped and monitoring conditions.
  • Use ERG, SDS, shipping papers and air monitoring to set final isolation, evacuation and decon actions.
Advertisement

📋 Copy & Share Field Card

UN 2777 — Mercury based pesticide, solid, poisonou
HAZMAT RADIO NOTE — UN 2777 Product: Mercury based pesticide, solid, poisonous Class 6 / Toxic / ERG 151 PPE: SCBA with chemical-resistant suit and gloves; Level A or B may be needed for dust, vapor, unknown concentration or skin-absorption risk. ISOLATION: Use the ERG guide initial isolation distance and increase for large spills, fire, dust release, drainage paths or downwind exposure. ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO

Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.

SMS WhatsApp
=== 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 water reaction is expected, but wetting can create toxic runoff or slurry; keep material out of drains. Extinguishing: Dry chemical, CO2, water spray or foam may be used for surrounding fires; avoid dispersing dust or contaminated runoff. PPE: SCBA with chemical-resistant suit and gloves; Level A or B may be needed for dust, vapor, unknown concentration or skin-absorption risk. Isolation: Use the ERG guide initial isolation distance and increase for large spills, fire, dust release, drainage paths or downwind exposure. — Key Hazards — • Mercury based pesticide may be highly toxic by inhalation, ingestion or skin absorption. • Liquid or dust contact can irritate or burn skin and eyes depending on the formulation. • Fire or heating may produce irritating, toxic and corrosive decomposition products. — First Actions — • Call 911 and the emergency response number shown on the shipping papers. • Keep unauthorized personnel away and establish an initial isolation perimeter. • Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect. • Avoid breathing vapors, dust, mist or smoke and prevent skin and eye contact. SOURCE: allfirefighter.com/hazmat/un/mercury-based-pesticide-solid-un-2777 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

SMS (short)
UN2777 Mercury based pesticide, solid, poisonous Cls6 ERG151 | allfirefighter.com/hazmat/un/mercury-based-pesticide-solid-un-2777SMS / 160 CHAR

Use for: Quick text to command or incoming units. Fits in a single SMS.

Open in Messages WhatsApp
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/mercury-based-pesticide-solid-un-2777

Related UN Numbers in Class 6

Open Class Guide →Hazmat Hub →
UN 1098UN 1135UN 1163UN 1181UN 1182UN 1238UN 1239UN 1244UN 1259UN 1510UN 1541UN 1544
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
Advertisement

Frequently Asked Questions about UN 2777

UN 2777 covers Mercury based pesticide, solid, poisonous. Use the shipping papers and SDS to confirm the exact product before choosing tactics.

Yes. Exposure may be harmful or fatal by inhalation, ingestion or skin absorption, depending on concentration and formulation.

It is not classed as a flammable liquid, but it may decompose or involve combustible packaging in a fire.

No violent water reaction is expected, but water can create toxic runoff or spread residues.

Dry chemical, CO2, water spray for cooling; avoid dispersing material with high pressure water

Use SCBA and chemical-resistant protective clothing. Level A or B may be needed when vapors, splash risk or product identity is uncertain.

This entry can cover different formulations, active ingredients and solvents, so response details may change by product.
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.
We use cookies to improve performance and user experience. Read Cookie Policy.