☣️ UN 3346 • CLASS 3
Phenoxyacetic acid derivative pesticide, liquid, flammable, poisonous
Placard: Flammable. 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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Quick details
UN 3346
Class: 3
Placard type: Flammable
ERG: Guide 131 (check current ERG)
Isolation: ERG 131: Initial isolation 50m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions
Chemical & Response Details
| Also known as | 2,4-D liquid formulationMCPA liquid pesticidePhenoxy herbicide liquidChlorophenoxy acid pesticide |
| Appearance | Clear to amber-colored liquid with mild aromatic or solvent-like odor. Flammable liquid pesticide formulation typically dissolved in organic solvents. |
| Flash Point | 23-60°C (73-140°F) depending on solvent formulation |
| Boiling Point | Varies by formulation, typically 100-200°C (212-392°F) |
| Vapor Density | Heavier than air (typically 3-5 relative to air) |
| Water Reactivity | No significant reaction with water, though may form emulsions or separate layers |
| Extinguishing | Alcohol-resistant foam (AR-AFFF), CO2, dry chemical; water spray for cooling only |
| PPE | ⚠️ Level B minimum; SCBA required; chemical-resistant suit and gloves mandatory due to high skin absorption hazard |
| Isolation | ERG 131: Initial isolation 50m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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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UN 3346 — Phenoxyacetic acid derivative pesticide, HAZMAT RADIO NOTE — UN 3346
Product: Phenoxyacetic acid derivative pesticide, liquid, flammable, poisonous
Class 3 / Flammable / ERG 131
PPE: Level B minimum; SCBA required; chemical-resistant suit and gloves mandatory due to high skin absorption hazard
ISOLATION: ERG 131: Initial isolation 50m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in 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 3346 — Phenoxyacetic acid derivative pesticide, liquid, flammable, poisonous
Class: 3 | Placard: Flammable | ERG Guide: 131
Appearance: Clear to amber-colored liquid with mild aromatic or solvent-like odor. Flammable liquid pesticide formulation typically dissolved in organic solvents.
Water Reactivity: No significant reaction with water, though may form emulsions or separate layers
Extinguishing: Alcohol-resistant foam (AR-AFFF), CO2, dry chemical; water spray for cooling only
PPE: Level B minimum; SCBA required; chemical-resistant suit and gloves mandatory due to high skin absorption hazard
Isolation: ERG 131: Initial isolation 50m in all directions; protect persons downwind; if tank/rail car involved in fire, isolate 800m in all directions
— 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/3346 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3346 Phenoxyacetic acid derivative pesticide, liquid, flammable, poisonous Cls3 ERG131 | allfirefighter.com/hazmat/un/3346SMS / 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/3346
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FAQ
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 mandatory due to high skin absorption hazard
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.