☣️ UN 3350 • CLASS 3
UN 3350 — Pyrethroid pesticide, liquid, flammable, poisonous
Placard: Flammable. 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 3350 Quick Details
UN 3350
Product name: Pyrethroid pesticide, liquid, flammable, poisonous
DOT Class: 3
Placard type: Flammable
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: isolate spill 50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation
Common Hazards of UN 3350
- 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 concentrateFlammable pyrethroid formulation |
| Appearance | Liquid formulation typically yellow to amber in color with a mild to pungent odor, depending on solvent carrier. Flammable liquid at room temperature. |
| Flash Point | Varies by formulation, typically 23-60°C (73-140°F) depending on solvent carrier |
| Boiling Point | Varies by formulation, typically 100-200°C (212-392°F) depending on solvent system |
| Vapor Density | Heavier than air (typically >3), vapors settle in low areas |
| Water Reactivity | No significant reaction with water, but immiscible; product floats or sinks depending on specific gravity |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3350
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE Requirements
⚠️ Level B minimum required; SCBA and chemical-resistant suit mandatory due to toxic vapors and dermal absorption hazard
Isolation & Evacuation
ERG 131: isolate spill 50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 3350 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 3350 — Pyrethroid pesticide, liquid, flammable,HAZMAT RADIO NOTE — UN 3350
Product: Pyrethroid pesticide, liquid, flammable, poisonous
Class 3 / Flammable / ERG 131
PPE: Level B minimum required; SCBA and chemical-resistant suit mandatory due to toxic vapors and dermal absorption hazard
ISOLATION: ERG 131: isolate spill 50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation
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 3350 — Pyrethroid pesticide, liquid, flammable, poisonous
Class: 3 | Placard: Flammable | ERG Guide: 131
Appearance: Liquid formulation typically yellow to amber in color with a mild to pungent odor, depending on solvent carrier. Flammable liquid at room temperature.
Water Reactivity: No significant reaction with water, but immiscible; product floats or sinks depending on specific gravity
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE: Level B minimum required; SCBA and chemical-resistant suit mandatory due to toxic vapors and dermal absorption hazard
Isolation: ERG 131: isolate spill 50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation
— 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/3350 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3350 Pyrethroid pesticide, liquid, flammable, poisonous Cls3 ERG131 | allfirefighter.com/hazmat/un/3350SMS / 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/3350
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Frequently Asked Questions about UN 3350
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 required; SCBA and chemical-resistant suit mandatory due to toxic vapors and dermal absorption hazard
Water reactivity: No significant reaction with water, but immiscible; product floats or sinks depending on specific gravity. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only.
ERG Guide 131 recommendation: ERG 131: isolate spill 50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation
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.