UN 3271 — Ethers, n.o.s.
Placard: Flammable. ERG Guide 127. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3271 is Ethers, n.o.s., a broad flammable ether entry assigned to ERG Guide 127. Flashback and peroxide formation review are important.
Hazard overview: HIGHLY FLAMMABLE ether liquid, n.o.s.; vapors may ignite easily and form explosive mixtures with air. Vapors are heavier than air and may travel to ignition sources and flash back. Vapor explosion hazard exists in drains, basements, sewers and confined areas.
Response guidance: For UN 3271, isolate the area, eliminate ignition sources and keep vapors out of drains. Use SCBA, contain runoff and select foam/dry chemical/CO2 using SDS and ERG 127.
Firefighter training notes: Training for UN 3271 should emphasize product verification, SCBA use, vapor/dust monitoring, fire behavior, decontamination and runoff control. Use ERG 127, SDS and local SOP.
Regulatory context: Ethers, 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, composition, concentration and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Ethers, n.o.s. should be stored in approved flammable-liquid containers with ventilation, ignition control, secondary containment and segregation from oxidizers and incompatible materials.
UN 3271 Quick Details
Common Hazards of UN 3271
- HIGHLY FLAMMABLE ether liquid, n.o.s.; vapors may ignite easily and form explosive mixtures with air.
- Vapors are heavier than air and may travel to ignition sources and flash back.
- Vapor explosion hazard exists in drains, basements, sewers and confined areas.
- Many ethers can form shock-sensitive peroxides during storage; verify age, inhibitor and peroxide status.
- Liquid may float on water and spread fire or contamination.
- Fire may produce carbon monoxide and irritating/toxic smoke.
- Exact ether determines toxicity, peroxide risk and foam selection.
Chemical Identity & Physical Properties
Colorless to pale yellow liquids with characteristic sweet, pungent ether odor. Highly volatile at room temperature with low viscosity.
| Also known as | Diethyl etherEthyl etherDiisopropyl etherMethyl tert-butyl ether (MTBE)Tetrahydrofuran (THF)DioxaneAnisole |
| Appearance | Colorless to pale yellow liquids with characteristic sweet, pungent ether odor. Highly volatile at room temperature with low viscosity. |
| Flash Point | -45C to -40C (-49F to -40F) for common ethers like diethyl ether |
| Boiling Point | 35C to 101C (95F to 214F) depending on specific ether |
| Vapor Density | 2.6 (heavier than air) for diethyl ether; most ethers are heavier than air |
| Water Reactivity | Most ethers are immiscible or slightly soluble in water with no significant reaction; some may form peroxides on prolonged storage |
Fireground Response Guidance — UN 3271
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, dust, smoke, fire or confined-space exposure. Wear chemical-resistant gloves, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 3271 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.
- Eliminate ignition sources if this can be done safely.
- 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 127, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3271 — Ethers, 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.