UN 3272 — Esters, n.o.s.
Placard: Flammable. ERG Guide 127. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3272 is Esters, n.o.s., a broad flammable ester entry assigned to ERG Guide 127. Flash point and runoff behavior vary by exact ester.
Hazard overview: FLAMMABLE ester liquid, n.o.s.; vapors may ignite and form explosive mixtures with air. Vapors are usually heavier than air and may travel to ignition sources and flash back. Some esters hydrolyze slowly, forming alcohols and organic acids.
Response guidance: For UN 3272, 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 3272 should emphasize product verification, SCBA use, vapor/dust monitoring, fire behavior, decontamination and runoff control. Use ERG 127, SDS and local SOP.
Regulatory context: Esters, 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: Esters, 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 3272 Quick Details
Common Hazards of UN 3272
- FLAMMABLE ester liquid, n.o.s.; vapors may ignite and form explosive mixtures with air.
- Vapors are usually heavier than air and may travel to ignition sources and flash back.
- Some esters hydrolyze slowly, forming alcohols and organic acids.
- Liquid may float or spread across water depending on exact ester.
- Fire may produce carbon monoxide and irritating organic smoke.
- Runoff to sewers may create fire, explosion and environmental hazards.
- Exact ester and flash point must be verified from SDS.
Chemical Identity & Physical Properties
Clear to pale yellow liquids with fruity or pleasant odors. Physical properties vary widely depending on specific ester composition. Typically lighter than water and immiscible.
| Also known as | Ester compoundsCarboxylic acid estersAlkyl estersOrganic estersEster mixtures |
| Appearance | Clear to pale yellow liquids with fruity or pleasant odors. Physical properties vary widely depending on specific ester composition. Typically lighter than water and immiscible. |
| Flash Point | Varies widely by ester type, typically -20C to 25C (-4F to 77F) for common flammable esters |
| Boiling Point | Varies by specific ester, typically 50C to 200C (122F to 392F) |
| Vapor Density | 2-4 (heavier than air for most common esters) |
| Water Reactivity | Generally stable in water; some esters may slowly hydrolyze to form alcohol and carboxylic acid |
Fireground Response Guidance — UN 3272
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 3272 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 3272 — Esters, 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.