UN 2475 — Vanadium trichloride
Placard: Corrosive. ERG Guide 157. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2475 is Vanadium trichloride, a toxic corrosive moisture-reactive solid assigned to ERG Guide 157. Dust, HCl fuming and acidic runoff are key hazards.
Hazard overview: TOXIC and CORROSIVE moisture-reactive solid; dust or solution can burn eyes, skin and respiratory tissue. Reacts with water or moist air to release hydrogen chloride fumes and heat. Hygroscopic material can fume or form acidic corrosive solution in humid air.
Response guidance: For UN 2475, isolate the area, avoid skin contact and use SCBA where vapor, dust, mist or fire is present. Contain toxic/corrosive runoff and verify product controls with SDS and ERG 157.
Firefighter training notes: Training for UN 2475 should emphasize toxic/corrosive exposure routes, skin absorption, SCBA use, decontamination, runoff containment and SDS verification. Use ERG 157, SDS and local SOP.
Regulatory context: Vanadium trichloride is regulated as a hazardous material for transport and emergency response. Storage, exposure, spill reporting, waste and fire-code duties depend on quantity, concentration and jurisdiction; verify shipping papers, SDS and local authority requirements.
Storage & handling: Vanadium trichloride should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2475 Quick Details
Common Hazards of UN 2475
- TOXIC and CORROSIVE moisture-reactive solid; dust or solution can burn eyes, skin and respiratory tissue.
- Reacts with water or moist air to release hydrogen chloride fumes and heat.
- Hygroscopic material can fume or form acidic corrosive solution in humid air.
- Non-combustible, but heating can produce toxic/corrosive vanadium and chloride fumes.
- Exposure may involve vanadium toxicity plus acid burns.
- Runoff may be acidic, toxic and environmentally harmful.
- Avoid dust generation and moisture spread.
Chemical Identity & Physical Properties
Pink to purple crystalline solid or powder. Hygroscopic with no distinct odor. Deliquesces in moist air forming a green solution.
| Also known as | Vanadium(III) chlorideVanadium chlorideTrichlorovanadiumVCl3 |
| CAS Number | 7718-98-1 |
| Appearance | Pink to purple crystalline solid or powder. Hygroscopic with no distinct odor. Deliquesces in moist air forming a green solution. |
| Flash Point | Not applicable (non-combustible solid) |
| Boiling Point | Decomposes before boiling at approximately 600C (1112F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water generating heat and hydrogen chloride fumes; highly hygroscopic |
Fireground Response Guidance — UN 2475
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing. Level A may be needed for heavy fuming, splash risk or unknown concentrations.
Isolation & Evacuation
First Actions for a UN 2475 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 or spilled material without proper training and PPE.
- Prevent contaminated dust, liquid, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 157, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2475 — Vanadium trichlorideUse 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.