☣️ UN 2627 • CLASS 5
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.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 2627 Quick Details
UN 2627
Product name: Nitrites, inorganic, n.o.s.
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill area 50m all directions; for large spills isolate 100m; if fire or explosion risk, evacuate 800m radius
Common Hazards of UN 2627
- These substances will accelerate burning when involved in a fire.
- Some may decompose explosively when heated or involved in a fire.
- May explode from heat or contamination.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
Chemical Identity & Physical Properties
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2627
Extinguishing Media
Do not use water directly on material; use water spray to cool containers; dry chemical or CO2 for small fires
PPE Requirements
⚠️ Level B minimum with SCBA; full protective clothing due to oxidizer hazard and potential for explosive decomposition; avoid contamination
Isolation & Evacuation
ERG 140: isolate spill area 50m all directions; for large spills isolate 100m; if fire or explosion risk, evacuate 800m radius
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2627 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 2627 — Nitrites, inorganic, n.o.s.HAZMAT RADIO NOTE — UN 2627
Product: Nitrites, inorganic, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; full protective clothing due to oxidizer hazard and potential for explosive decomposition; avoid contamination
ISOLATION: ERG 140: isolate spill area 50m all directions; for large spills isolate 100m; if fire or explosion risk, evacuate 800m radius
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 2627 — Nitrites, inorganic, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
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.
Water Reactivity: Generally soluble in water; solutions may be corrosive or reactive with acids producing toxic nitrogen oxides
Extinguishing: Do not use water directly on material; use water spray to cool containers; dry chemical or CO2 for small fires
PPE: Level B minimum with SCBA; full protective clothing due to oxidizer hazard and potential for explosive decomposition; avoid contamination
Isolation: ERG 140: isolate spill area 50m all directions; for large spills isolate 100m; if fire or explosion risk, evacuate 800m radius
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• Some may decompose explosively when heated or involved in a fire.
• May explode from heat or contamination.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/2627 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2627 Nitrites, inorganic, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/2627SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/2627
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Frequently Asked Questions about UN 2627
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA; full protective clothing due to oxidizer hazard and potential for explosive decomposition; avoid contamination
Water reactivity: Generally soluble in water; solutions may be corrosive or reactive with acids producing toxic nitrogen oxides. Recommended extinguishing: Do not use water directly on material; use water spray to cool containers; dry chemical or CO2 for small fires.
ERG Guide 140 recommendation: ERG 140: isolate spill area 50m all directions; for large spills isolate 100m; if fire or explosion risk, evacuate 800m radius
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 140 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.