☣️ UN 3464 • CLASS 6
UN 3464 — Organophosphorus compound, solid, poisonous, n.o.s.
Placard: Toxic. ERG Guide 151. 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 3464 Quick Details
UN 3464
Product name: Organophosphorus compound, solid, poisonous, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25m all directions; if large spill isolate 50m; evacuate immediate area and deny entry
Common Hazards of UN 3464
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | Organophosphate compound solidPhosphorus organic compound solidOrganophosphorus solid NOSOP compound solid |
| Appearance | Variable appearance depending on specific compound; typically white to tan crystalline solid or powder with little to no odor at room temperature. Highly toxic organophosphorus materials. |
| Flash Point | Variable, depends on specific compound; many are non-flammable solids |
| Boiling Point | Variable, depends on specific compound; many decompose before boiling |
| Vapor Density | Not applicable (solid at room temperature) |
| Water Reactivity | Variable; some organophosphorus compounds may hydrolyze slowly in water, releasing toxic vapors |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3464
Extinguishing Media
Dry chemical, CO2, water spray for cooling; avoid direct water contact with bulk material
PPE Requirements
⚠️ Level A or B with full-face SCBA required; chemical-resistant suit essential; avoid all skin contact; extreme toxicity hazard
Isolation & Evacuation
ERG 151: isolate spill 25m all directions; if large spill isolate 50m; evacuate immediate area and deny entry
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 3464 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 3464 — Organophosphorus compound, solid, poisonHAZMAT RADIO NOTE — UN 3464
Product: Organophosphorus compound, solid, poisonous, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A or B with full-face SCBA required; chemical-resistant suit essential; avoid all skin contact; extreme toxicity hazard
ISOLATION: ERG 151: isolate spill 25m all directions; if large spill isolate 50m; evacuate immediate area and deny entry
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 3464 — Organophosphorus compound, solid, poisonous, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific compound; typically white to tan crystalline solid or powder with little to no odor at room temperature. Highly toxic organophosphorus materials.
Water Reactivity: Variable; some organophosphorus compounds may hydrolyze slowly in water, releasing toxic vapors
Extinguishing: Dry chemical, CO2, water spray for cooling; avoid direct water contact with bulk material
PPE: Level A or B with full-face SCBA required; chemical-resistant suit essential; avoid all skin contact; extreme toxicity hazard
Isolation: ERG 151: isolate spill 25m all directions; if large spill isolate 50m; evacuate immediate area and deny entry
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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/3464 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3464 Organophosphorus compound, solid, poisonous, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3464SMS / 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/3464
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Frequently Asked Questions about UN 3464
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Containers may explode when heated. Runoff may pollute waterways.
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 full-face SCBA required; chemical-resistant suit essential; avoid all skin contact; extreme toxicity hazard
Water reactivity: Variable; some organophosphorus compounds may hydrolyze slowly in water, releasing toxic vapors. Recommended extinguishing: Dry chemical, CO2, water spray for cooling; avoid direct water contact with bulk material.
ERG Guide 151 recommendation: ERG 151: isolate spill 25m all directions; if large spill isolate 50m; evacuate immediate area and deny entry
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.