UN 2627 — Nitrites, inorganic, n.o.s.
Placard: Oxidizer. ERG Guide 140. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2627 is Nitrites, inorganic, n.o.s., a broad inorganic oxidizer entry assigned to ERG Guide 140. Exact salt and contamination risks must be verified.
Hazard overview: OXIDIZING inorganic nitrite salt; can intensify fire involving combustible materials. May decompose when heated or contaminated, releasing toxic nitrogen oxides. Contact with acids can release nitrogen oxides and may create heat or pressure hazards.
Response guidance: For UN 2627, isolate the area, remove combustibles and prevent contact with fuels, acids, reducing agents or ammonium materials. Use oxidizer-compatible tactics and contain toxic/oxidizing runoff under ERG 140.
Firefighter training notes: Training for UN 2627 should emphasize oxidizer contamination control, acid/NOx release, incompatible fuels or reducing agents, container cooling and toxic runoff containment. Use ERG 140, SDS and local SOP.
Regulatory context: Nitrites, inorganic, n.o.s. 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: Nitrites, inorganic, n.o.s. should be stored in compatible oxidizer-rated containers away from acids, fuels, organics, reducing agents, ammonium compounds and combustible contamination.
UN 2627 Quick Details
Common Hazards of UN 2627
- OXIDIZING inorganic nitrite salt; can intensify fire involving combustible materials.
- May decompose when heated or contaminated, releasing toxic nitrogen oxides.
- Contact with acids can release nitrogen oxides and may create heat or pressure hazards.
- Contact with fuels, organics, reducing agents or ammonium compounds can create fire or decomposition risk.
- Dust or solution may irritate or burn eyes, skin and respiratory tissue depending on the exact salt.
- Runoff may be oxidizing, toxic and harmful to waterways.
- Exact nitrite compound must be verified from SDS and shipping papers.
Chemical Identity & Physical Properties
Typically white to yellowish crystalline solids or powders at room temperature. Odorless or may have a slight characteristic odor depending on the specific nitrite compound.
| Also known as | Inorganic nitrite saltsMetal nitrites n.o.s.Nitrous acid saltsNitrite compounds |
| Appearance | Typically white to yellowish crystalline solids or powders at room temperature. Odorless or may have a slight characteristic odor depending on the specific nitrite compound. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally soluble in water; solutions may be corrosive or reactive with acids producing toxic nitrogen oxides |
Fireground Response Guidance — UN 2627
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for fire, decomposition fumes or confined-space exposure. Wear chemical-resistant clothing, eye/face protection and avoid oxidizer contamination.
Isolation & Evacuation
First Actions for a UN 2627 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.
- Keep fuels, organics, acids, reducing agents and ammonium materials away from the oxidizer.
- 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 140, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2627 — Nitrites, inorganic, 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.