UN 2687 — Dicyclohexylammonium nitrite
Placard: Flammable Solid. ERG Guide 133. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Dicyclohexylammonium nitrite is a flammable nitrite salt handled as a solid or powder. Dust control, ignition control and respiratory protection are important during response.
Hazard overview: The material can burn when exposed to heat or flame, and fire may generate irritating or toxic nitrogen oxide fumes. Dust or powder releases increase inhalation and ignition concerns.
Response guidance: Isolate the area, avoid dust generation and remove ignition sources. Use dry chemical, CO2, foam or water spray from a safe distance, and cool exposed containers.
Firefighter training notes: Train responders to avoid sweeping or dispersing powder and to control ignition sources before product collection.
Regulatory context: Confirm UN 2687 and ERG 133 on the shipping paper and check the SDS for stabilizers or product-specific additives.
Storage & handling: Store dry, closed and away from heat, sparks, acids, oxidizers and combustible contamination.
UN 2687 Quick Details
Common Hazards of UN 2687
- Flammable solid; dust or finely divided material may ignite more readily than compact material.
- Heat, friction, sparks or open flame can start decomposition or burning.
- Fire may produce irritating nitrogen oxides and amine-containing smoke.
- Dust can irritate eyes, skin and the respiratory tract.
- Runoff from fire control may carry contaminated residues.
- Containers may rupture when heated.
- Keep away from strong oxidizers, acids and ignition sources.
Chemical Identity & Physical Properties
White to off-white crystalline solid or powder with possible amine odor; hygroscopic and soluble in water.
| Also known as | DCHANDicyclohexylamine nitriteN,N-Dicyclohexylammonium nitriteDicyclohexylazanium nitrite |
| CAS Number | 3129-91-7 |
| Appearance | White to off-white crystalline solid or powder at room temperature. May have a slight amine-like odor. Hygroscopic material that may absorb moisture from air. |
| Flash Point | Not applicable (combustible solid, no liquid flash point) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but may decompose slowly releasing nitrous fumes |
Fireground Response Guidance — UN 2687
Extinguishing Media
PPE Requirements
Use SCBA for fire or dust conditions with chemical-resistant gloves, eye protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 2687 Incident
- Call 911 and the emergency response number shown on shipping papers or container documents.
- Keep unauthorized personnel away and establish an initial isolation perimeter.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing vapors, dust, smoke or mist and prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate chemical PPE.
- Ventilate confined spaces only when personnel are trained, monitored and properly equipped.
- Use ERG guidance, SDS, shipping papers and air monitoring before committing crews.
📋 Copy & Share Field Card
UN 2687 — Dicyclohexylammonium nitriteUse 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.