☣️ UN 3351 • CLASS 6
UN 3351 — Pyrethroid pesticide, liquid, poisonous, flammable
Placard: Toxic. ERG Guide 131. 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 3351 Quick Details
UN 3351
Product name: Pyrethroid pesticide, liquid, poisonous, flammable
DOT Class: 6
Placard type: Toxic
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: isolate spill or leak area immediately for at least 50m in all directions; evacuate 800m downwind if large spill or fire
Common Hazards of UN 3351
- TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
- Inhalation or contact with some of these materials will irritate or burn skin and eyes.
- Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
- Fire will produce irritating, corrosive and/or toxic gases.
- Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
- Runoff from fire control or dilution water may cause environmental contamination.
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
Chemical Identity & Physical Properties
| Also known as | Pyrethroid insecticide solutionSynthetic pyrethrin pesticidePyrethroid concentrate liquidFlammable pyrethroid formulation |
| Appearance | Typically a clear to amber-colored liquid with a mild aromatic or petroleum-like odor. Flammable liquid pesticide formulation at room temperature. |
| Flash Point | 23-61C (73-142F) depending on formulation solvent |
| Boiling Point | Varies by formulation, typically 150-250C (302-482F) |
| Vapor Density | Heavier than air (typically 4-6 relative to air) |
| Water Reactivity | No significant reaction with water; may form surface slicks or emulsions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3351
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; water spray for cooling containers
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit and gloves; prevent skin contact due to dermal absorption hazard
Isolation & Evacuation
ERG 131: isolate spill or leak area immediately for at least 50m in all directions; evacuate 800m downwind if large spill or fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 3351 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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 50 meters (150 feet) in all directions.
- 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 3351 — Pyrethroid pesticide, liquid, poisonous,HAZMAT RADIO NOTE — UN 3351
Product: Pyrethroid pesticide, liquid, poisonous, flammable
Class 6 / Toxic / ERG 131
PPE: Level B minimum; SCBA required; chemical-resistant suit and gloves; prevent skin contact due to dermal absorption hazard
ISOLATION: ERG 131: isolate spill or leak area immediately for at least 50m in all directions; evacuate 800m downwind if large spill or fire
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 3351 — Pyrethroid pesticide, liquid, poisonous, flammable
Class: 6 | Placard: Toxic | ERG Guide: 131
Appearance: Typically a clear to amber-colored liquid with a mild aromatic or petroleum-like odor. Flammable liquid pesticide formulation at room temperature.
Water Reactivity: No significant reaction with water; may form surface slicks or emulsions
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling containers
PPE: Level B minimum; SCBA required; chemical-resistant suit and gloves; prevent skin contact due to dermal absorption hazard
Isolation: ERG 131: isolate spill or leak area immediately for at least 50m in all directions; evacuate 800m downwind if large spill or fire
— Key Hazards —
• TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
• Inhalation or contact with some of these materials will irritate or burn skin and eyes.
• Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
— 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3351 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3351 Pyrethroid pesticide, liquid, poisonous, flammable Cls6 ERG131 | allfirefighter.com/hazmat/un/3351SMS / 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/3351
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Frequently Asked Questions about UN 3351
TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears). Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas. Runoff from fire control or dilution water may cause environmental contamination. HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air.
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 B minimum; SCBA required; chemical-resistant suit and gloves; prevent skin contact due to dermal absorption hazard
Water reactivity: No significant reaction with water; may form surface slicks or emulsions. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling containers.
ERG Guide 131 recommendation: ERG 131: isolate spill or leak area immediately for at least 50m in all directions; evacuate 800m downwind if large spill or fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 131 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.