☣️ UN 2783 • CLASS 6
UN 2783 — Organophosphorus pesticide, solid, poisonous
Placard: Toxic. ERG Guide 152. 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 2783 Quick Details
UN 2783
Product name: Organophosphorus pesticide, solid, poisonous
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: Small spill isolate 25m all directions; large spill isolate 50m all directions, evacuate 300m downwind if spilled in water
Common Hazards of UN 2783
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Combustible material: may burn but does not ignite readily.
- Containers may explode when heated.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
Chemical Identity & Physical Properties
| Also known as | organophosphate pesticideorganophosphorus insecticideOP pesticide solidphosphoric acid ester pesticide |
| Appearance | Solid material varying in color from white to tan or brown depending on specific compound. May be crystalline, granular, or powder form. Odor ranges from odorless to garlic-like or fruity depending on formulation. |
| Flash Point | Varies by specific compound; many are combustible solids with flash points above 93C (200F) |
| Boiling Point | Not applicable (solid material, may decompose before melting) |
| Vapor Density | Not applicable (solid at room temperature) |
| Water Reactivity | Generally stable in water but may slowly hydrolyze; some formulations may react with strong bases |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2783
Extinguishing Media
Dry chemical, CO2, or water spray acceptable; foam may be used for large fires
PPE Requirements
⚠️ Level A or B required; full-face SCBA mandatory; chemical-resistant suit with double gloves; zero skin contact tolerance due to dermal absorption hazard
Isolation & Evacuation
ERG 152: Small spill isolate 25m all directions; large spill isolate 50m all directions, evacuate 300m downwind if spilled in water
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 2783 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.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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 2783 — Organophosphorus pesticide, solid, poisoHAZMAT RADIO NOTE — UN 2783
Product: Organophosphorus pesticide, solid, poisonous
Class 6 / Toxic / ERG 152
PPE: Level A or B required; full-face SCBA mandatory; chemical-resistant suit with double gloves; zero skin contact tolerance due to dermal absorption hazard
ISOLATION: ERG 152: Small spill isolate 25m all directions; large spill isolate 50m all directions, evacuate 300m downwind if spilled in water
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 2783 — Organophosphorus pesticide, solid, poisonous
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Solid material varying in color from white to tan or brown depending on specific compound. May be crystalline, granular, or powder form. Odor ranges from odorless to garlic-like or fruity depending on formulation.
Water Reactivity: Generally stable in water but may slowly hydrolyze; some formulations may react with strong bases
Extinguishing: Dry chemical, CO2, or water spray acceptable; foam may be used for large fires
PPE: Level A or B required; full-face SCBA mandatory; chemical-resistant suit with double gloves; zero skin contact tolerance due to dermal absorption hazard
Isolation: ERG 152: Small spill isolate 25m all directions; large spill isolate 50m all directions, evacuate 300m downwind if spilled in water
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/2783 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2783 Organophosphorus pesticide, solid, poisonous Cls6 ERG152 | allfirefighter.com/hazmat/un/2783SMS / 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/2783
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Frequently Asked Questions about UN 2783
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Combustible material: may burn but does not ignite readily. Containers may explode when heated. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
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 required; full-face SCBA mandatory; chemical-resistant suit with double gloves; zero skin contact tolerance due to dermal absorption hazard
Water reactivity: Generally stable in water but may slowly hydrolyze; some formulations may react with strong bases. Recommended extinguishing: Dry chemical, CO2, or water spray acceptable; foam may be used for large fires.
ERG Guide 152 recommendation: ERG 152: Small spill isolate 25m all directions; large spill isolate 50m all directions, evacuate 300m downwind if spilled in water
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 152 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.