UN 2647 — Malononitrile
Placard: Toxic. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2647 is Malononitrile, a toxic nitrile assigned to ERG Guide 153. Skin exposure and hydrogen-cyanide-type fire products are key hazards.
Hazard overview: TOXIC nitrile solid/liquid; inhalation, ingestion or skin absorption may cause severe injury. Skin contact and contaminated clothing can extend exposure. Combustible material: may burn but does not ignite readily.
Response guidance: For UN 2647, isolate the area, avoid skin contact and use SCBA where dust, vapor, mist or fire is present. Prevent spread of contaminated runoff, cool containers from protection and verify controls with SDS and ERG 153.
Firefighter training notes: Training for UN 2647 should emphasize toxic exposure routes, skin absorption, SCBA use, dust/vapor control, decontamination, runoff containment and SDS verification. Use ERG 153, SDS and local SOP.
Regulatory context: Malononitrile 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: Malononitrile should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2647 Quick Details
Common Hazards of UN 2647
- TOXIC nitrile solid/liquid; inhalation, ingestion or skin absorption may cause severe injury.
- Skin contact and contaminated clothing can extend exposure.
- Combustible material: may burn but does not ignite readily.
- Heating or fire may produce hydrogen cyanide, nitrogen oxides and other toxic gases.
- Dissolves or hydrolyzes slowly in water, creating toxic runoff.
- Molten material may cause thermal and toxic contact exposure.
- Avoid dust/vapor generation and control decontamination waste.
Chemical Identity & Physical Properties
White crystalline solid at room temperature with a slightly pungent odor. Melts at approximately 30-32°C to form a clear liquid.
| Also known as | Malonic dinitrileDicyanomethanePropanedinitrileMethylene dicyanide |
| CAS Number | 109-77-3 |
| Appearance | White crystalline solid at room temperature with a slightly pungent odor. Melts at approximately 30-32°C to form a clear liquid. |
| Flash Point | 129°C (264°F) |
| Boiling Point | 220°C (428°F) |
| Vapor Density | 2.3 (heavier than air) |
| Water Reactivity | Soluble in water with slow hydrolysis; no violent reaction under normal conditions |
Fireground Response Guidance — UN 2647
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for dust, vapor, mist, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 2647 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 153, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2647 — MalononitrileUse 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.