☣️ UN 2726 • CLASS 5
UN 2726 — Nickel nitrite
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 2726 Quick Details
UN 2726
Product name: Nickel nitrite
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation
Common Hazards of UN 2726
- 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 | Nickel(II) nitriteNickelous nitriteNitrous acid nickel saltNickel dinitrite |
| CAS Number | 17861-62-0 |
| Appearance | Green to yellowish-green crystalline solid or powder. Odorless or slight nitrous odor at room temperature. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; solution may be acidic and potentially unstable |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2726
Extinguishing Media
Dry chemical, CO2, dry sand; avoid water streams on bulk material
PPE Requirements
⚠️ Level B minimum with SCBA; full face protection and chemical-resistant suit required
Isolation & Evacuation
ERG 140: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2726 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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📋 Copy & Share Field Card
UN 2726 — Nickel nitriteHAZMAT RADIO NOTE — UN 2726
Product: Nickel nitrite
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; full face protection and chemical-resistant suit required
ISOLATION: ERG 140: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation
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 2726 — Nickel nitrite
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Green to yellowish-green crystalline solid or powder. Odorless or slight nitrous odor at room temperature.
Water Reactivity: Soluble in water; solution may be acidic and potentially unstable
Extinguishing: Dry chemical, CO2, dry sand; avoid water streams on bulk material
PPE: Level B minimum with SCBA; full face protection and chemical-resistant suit required
Isolation: ERG 140: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation
— 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/2726 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2726 Nickel nitrite Cls5 ERG140 | ERG 140: isolate spill 25m all directions; for large fire isolate 800m and consi | allfirefighter.com/hazmat/un/2726SMS / 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/2726
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Frequently Asked Questions about UN 2726
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 face protection and chemical-resistant suit required
Water reactivity: Soluble in water; solution may be acidic and potentially unstable. Recommended extinguishing: Dry chemical, CO2, dry sand; avoid water streams on bulk material.
ERG Guide 140 recommendation: ERG 140: isolate spill 25m all directions; for large fire isolate 800m and consider evacuation
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.