☣️ UN 2782 • CLASS 3
UN 2782 — Bipyridilium 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 2782 Quick Details
UN 2782
Product name: Bipyridilium pesticide, liquid, flammable, poisonous
DOT Class: 3
Placard type: Flammable
ERG Guide: 131 (check current ERG)
Initial isolation: ERG 131: Initially isolate 50m all directions; if tank/rail car involved isolate 800m and consider evacuation 800m downwind; product is highly toxic
Common Hazards of UN 2782
- 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 | DiquatParaquat pesticide solutionBipyridinium herbicideFlammable pesticide concentrate |
| Appearance | Liquid, typically yellow to amber colored with slight amine-like odor. Flammable pesticide formulation in organic solvent carrier 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 100-150°C (212-302°F) depending on solvent |
| Vapor Density | Greater than 1 (heavier than air), exact value depends on solvent carrier |
| Water Reactivity | Generally miscible or dispersible in water; no violent reaction but dilution does not reduce toxicity |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2782
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray; regular foam may be ineffective
PPE Requirements
⚠️ Level A or B with SCBA required; full chemical-resistant suit, double gloves; avoid all skin contact - highly toxic by absorption
Isolation & Evacuation
ERG 131: Initially isolate 50m all directions; if tank/rail car involved isolate 800m and consider evacuation 800m downwind; product is highly toxic
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 131).
First Actions for a UN 2782 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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UN 2782 — Bipyridilium pesticide, liquid, flammablHAZMAT RADIO NOTE — UN 2782
Product: Bipyridilium pesticide, liquid, flammable, poisonous
Class 3 / Flammable / ERG 131
PPE: Level A or B with SCBA required; full chemical-resistant suit, double gloves; avoid all skin contact - highly toxic by absorption
ISOLATION: ERG 131: Initially isolate 50m all directions; if tank/rail car involved isolate 800m and consider evacuation 800m downwind; product is highly toxic
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 2782 — Bipyridilium pesticide, liquid, flammable, poisonous
Class: 3 | Placard: Flammable | ERG Guide: 131
Appearance: Liquid, typically yellow to amber colored with slight amine-like odor. Flammable pesticide formulation in organic solvent carrier at room temperature.
Water Reactivity: Generally miscible or dispersible in water; no violent reaction but dilution does not reduce toxicity
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray; regular foam may be ineffective
PPE: Level A or B with SCBA required; full chemical-resistant suit, double gloves; avoid all skin contact - highly toxic by absorption
Isolation: ERG 131: Initially isolate 50m all directions; if tank/rail car involved isolate 800m and consider evacuation 800m downwind; product is highly toxic
— 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/2782 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2782 Bipyridilium pesticide, liquid, flammable, poisonous Cls3 ERG131 | allfirefighter.com/hazmat/un/2782SMS / 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/2782
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Frequently Asked Questions about UN 2782
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 A or B with SCBA required; full chemical-resistant suit, double gloves; avoid all skin contact - highly toxic by absorption
Water reactivity: Generally miscible or dispersible in water; no violent reaction but dilution does not reduce toxicity. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray; regular foam may be ineffective.
ERG Guide 131 recommendation: ERG 131: Initially isolate 50m all directions; if tank/rail car involved isolate 800m and consider evacuation 800m downwind; product is highly toxic
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.