UN 3465 — Organoarsenic compound, solid, n.o.s.
Placard: Toxic. ERG Guide 151. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3465 is Organoarsenic compound, solid, n.o.s., a broad highly toxic organoarsenic solid assigned to ERG Guide 151. Arsenic runoff and dust control are key.
Hazard overview: HIGHLY TOXIC organoarsenic solid, n.o.s.; inhalation of dust, ingestion or skin absorption may be fatal. Dust can contaminate clothing, tools, soil and runoff. Combustibility varies by exact compound and carrier.
Response guidance: For UN 3465, isolate the area, avoid all skin contact and use SCBA with chemical protection. Prevent runoff spread and verify exact compound with SDS and ERG 151.
Firefighter training notes: Training for UN 3465 should emphasize high-toxicity exposure routes, skin absorption, SCBA/Level A decisions, decontamination, runoff control and exact-compound verification. Use ERG 151, SDS and local SOP.
Regulatory context: Organoarsenic compound, solid, n.o.s. is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, concentration, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Organoarsenic compound, solid, n.o.s. should be stored in tightly closed compatible containers with restricted access, ventilation, secondary containment and segregation from moisture, oxidizers and incompatible materials per SDS.
UN 3465 Quick Details
Common Hazards of UN 3465
- HIGHLY TOXIC organoarsenic solid, n.o.s.; inhalation of dust, ingestion or skin absorption may be fatal.
- Dust can contaminate clothing, tools, soil and runoff.
- Combustibility varies by exact compound and carrier.
- Fire may produce arsenic oxides and toxic/corrosive smoke.
- Runoff may carry persistent arsenic contamination and harm waterways.
- Odor is not a reliable warning for exposure.
- Exact compound, solubility and concentration must be verified from SDS.
Chemical Identity & Physical Properties
Variable appearance depending on specific compound; typically white to gray crystalline or powdered solid with little to no odor at room temperature.
| 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 |
Fireground Response Guidance — UN 3465
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and full chemical protective clothing. Level A may be needed for unknown compound, dust, vapor, splash or high skin-absorption risk.
Isolation & Evacuation
First Actions for a UN 3465 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers, equipment or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 151, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3465 — Organoarsenic compound, solid, n.o.s.Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.