☣️ UN 3465 • CLASS 6
Organoarsenic compound, solid, n.o.s.
Placard: Toxic. 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 3465
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: isolate spill 25m all directions; if tank/rail car involved in fire isolate 800m all directions and consider evacuation
Chemical & Response Details
| Also known as | Arsenic organic compoundOrganoarsenical solidArsenical pesticide solidOrganic arsenic derivative |
| Appearance | Variable appearance depending on specific compound; typically white to gray crystalline or powdered solid with little to no odor at room temperature. |
| Flash Point | Not applicable (solid, flash point varies by specific compound) |
| Boiling Point | Not applicable (decomposes before boiling, varies by compound) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Generally stable with water, but some compounds may slowly hydrolyze or release toxic vapors |
| Extinguishing | Dry chemical, CO2, sand, or earth; water spray may be used to keep containers cool |
| PPE | ⚠️ Level B minimum required; SCBA with full protective suit; avoid any skin contact due to high toxicity and potential absorption |
| Isolation | ERG 151: isolate spill 25m all directions; if tank/rail car involved in fire isolate 800m all directions and consider evacuation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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.
- 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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UN 3465 — Organoarsenic compound, solid, n.o.s. HAZMAT RADIO NOTE — UN 3465
Product: Organoarsenic compound, solid, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level B minimum required; SCBA with full protective suit; avoid any skin contact due to high toxicity and potential absorption
ISOLATION: ERG 151: isolate spill 25m all directions; if tank/rail car involved in fire isolate 800m all directions 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 3465 — Organoarsenic compound, solid, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific compound; typically white to gray crystalline or powdered solid with little to no odor at room temperature.
Water Reactivity: Generally stable with water, but some compounds may slowly hydrolyze or release toxic vapors
Extinguishing: Dry chemical, CO2, sand, or earth; water spray may be used to keep containers cool
PPE: Level B minimum required; SCBA with full protective suit; avoid any skin contact due to high toxicity and potential absorption
Isolation: ERG 151: isolate spill 25m all directions; if tank/rail car involved in fire isolate 800m all directions and consider evacuation
— 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/3465 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3465 Organoarsenic compound, solid, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/3465SMS / 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/3465
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FAQ
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 B minimum required; SCBA with full protective suit; avoid any skin contact due to high toxicity and potential absorption
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.