UN 2679 — Lithium hydroxide, solution
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2679 is Lithium hydroxide, solution, a strongly corrosive alkali solution assigned to ERG Guide 154. Concentration controls burn severity and heat of dilution.
Hazard overview: STRONGLY CORROSIVE alkali hydroxide solution; contact can cause severe burns to eyes, skin and respiratory tissue. Mist or spray can injure lungs and mucous membranes. Non-flammable aqueous solution, but contact with some metals may generate flammable hydrogen gas.
Response guidance: For UN 2679, isolate the area, avoid mist or splash exposure and use SCBA where vapor/mist is present. Contain alkaline runoff, keep acids away and verify concentration controls with SDS and ERG 154.
Firefighter training notes: Training for UN 2679 should emphasize caustic burns, mist/vapor control, heat of dilution, acid incompatibility, decontamination and alkaline runoff containment. Use ERG 154, SDS and local SOP.
Regulatory context: Lithium hydroxide, solution 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: Lithium hydroxide, solution should be stored in compatible corrosion-resistant containers with ventilation, secondary containment and segregation from acids, metals where incompatible and reactive materials.
UN 2679 Quick Details
Common Hazards of UN 2679
- STRONGLY CORROSIVE alkali hydroxide solution; contact can cause severe burns to eyes, skin and respiratory tissue.
- Mist or spray can injure lungs and mucous membranes.
- Non-flammable aqueous solution, but contact with some metals may generate flammable hydrogen gas.
- Mixing with acids can release significant heat and cause splattering.
- Runoff may be strongly alkaline, corrosive and harmful to waterways.
- Containers may fail or leak when heated or damaged.
- Exact concentration affects heat of dilution and burn severity.
Chemical Identity & Physical Properties
Clear to slightly turbid colorless aqueous solution. Odorless. Strongly alkaline with soapy feel.
| Also known as | Lithium hydroxide solutionLithium hydrate solutionLiOH solutionCaustic lithium solution |
| CAS Number | 1310-65-2 |
| Appearance | Clear to slightly turbid colorless aqueous solution. Odorless. Strongly alkaline with soapy feel. |
| Flash Point | Not applicable (aqueous solution) |
| Boiling Point | Approximately 100C (212F), varies with concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already dissolved in water; dilution generates heat |
Fireground Response Guidance — UN 2679
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, mist, dust, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 2679 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 liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 154, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2679 — Lithium hydroxide, solutionUse 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.