☣️ 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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⚠️ 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.
Pyrethroid pesticide, liquid, poisonous, flammable covers pyrethroid insecticide formulations where the exact active ingredient and carrier may vary by shipment. Confirm the product name on shipping papers or the SDS before choosing cleanup, extinguishing media or PPE.
Hazard overview: This entry is poisonous and may be fatal by inhalation, ingestion or skin absorption. Flammable solvent carriers can produce ignitable vapors and toxic smoke.
Response guidance: Isolate the area using ERG 131, keep responders upwind and prevent runoff from entering drains or waterways. Use compatible extinguishing media for the formulation and avoid spreading contaminated liquid or dust.
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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
Typically a clear to amber-colored liquid with a mild aromatic or petroleum-like odor. Flammable liquid pesticide formulation at room temperature. Exact appearance can vary by commercial formulation.
| 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
Use Level B minimum with SCBA and chemical-resistant suit, gloves and boots; upgrade protection for unknown concentration, vapor release or fire involvement.
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 the emergency response telephone number on the shipping paper, if available.
- 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 downwind precautions when vapor, dust, or runoff hazards are present.
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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 the emergency response telephone number on the shipping paper, if available.
• 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/pyrethroid-pesticide-liquid-poisonous-un-3351 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3351 Pyrethroid pesticide, liquid, poisonous, flammable Cls6 ERG131 | allfirefighter.com/hazmat/un/pyrethroid-pesticide-liquid-poisonous-un-3351SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/pyrethroid-pesticide-liquid-poisonous-un-3351
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Frequently Asked Questions about UN 3351
UN 3351 is the entry for Pyrethroid pesticide, liquid, poisonous, flammable. It should be treated as a poisonous pesticide formulation until the exact product is verified.
Yes, this entry includes a flammable liquid formulation.
Inhalation, ingestion and skin absorption can be dangerous; avoid all direct contact.
SCBA with chemical-resistant clothing, gloves and boots is recommended for emergency response.
Water spray may be used for cooling or fire control when compatible, but avoid runoff and avoid spreading contamination.
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.