UN 2336 — Allyl formate
Placard: Flammable. ERG Guide 131. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2336 is Allyl formate, a toxic flammable liquid assigned to ERG Guide 131. Response priorities are vapor ignition control, respiratory protection and prevention of skin exposure.
Hazard overview: TOXIC and HIGHLY FLAMMABLE liquid; inhalation, ingestion or skin absorption may cause serious injury. Vapors may ignite easily and form explosive mixtures with air. Vapors are heavier than air and may travel to ignition sources and flash back.
Response guidance: For UN 2336, isolate the area, eliminate ignition sources, keep vapors out of drains and use SCBA in vapor or fire conditions. Cool containers from a protected distance and select foam/dry chemical/CO2 based on the SDS.
Firefighter training notes: Training for UN 2336 should emphasize toxic vapor recognition, SCBA use, skin-contact prevention, sewer flashback, container cooling, decontamination and runoff control. Use ERG 131, SDS and local SOP.
Regulatory context: Allyl formate 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: Allyl formate should be stored in approved flammable-liquid containers with ventilation, bonding/grounding where required, spill containment and separation from heat, ignition sources, oxidizers and incompatible materials.
UN 2336 Quick Details
Common Hazards of UN 2336
- TOXIC and HIGHLY FLAMMABLE liquid; inhalation, ingestion or skin absorption may cause serious injury.
- Vapors may ignite easily and form explosive mixtures with air.
- Vapors are heavier than air and may travel to ignition sources and flash back.
- Liquid or vapor can irritate or burn eyes, skin and respiratory tissue.
- Runoff to sewers may create fire, explosion and toxic contamination hazards.
- Fire may produce carbon monoxide, nitrogen oxides or other irritating/toxic gases depending on product.
- Containers may rupture or explode when heated.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with a pungent, fruity odor. Liquid at room temperature.
| Also known as | Formic acid allyl esterAllyl methanoate2-Propenyl formate |
| CAS Number | 1838-59-1 |
| Appearance | Colorless to pale yellow liquid with a pungent, fruity odor. Liquid at room temperature. |
| Flash Point | -2C (28F) |
| Boiling Point | 83C (181F) |
| Vapor Density | 3.0 (heavier than air) |
| Water Reactivity | Slightly soluble in water; may undergo slow hydrolysis |
Fireground Response Guidance — UN 2336
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing; avoid skin contact.
Isolation & Evacuation
First Actions for a UN 2336 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; keep responders out of low vapor areas.
- Eliminate ignition sources if this can be done safely.
- Avoid breathing vapor, mist or smoke and avoid skin or eye contact.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 131, SDS, shipping papers and air monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2336 — Allyl formateUse 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.