☣️ 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.
UN 2726 At a Glance
UN 2726 (Nickel nitrite) is listed as DOT Class 5 Oxidizer and is assigned to ERG Guide 140. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
Nickel nitrite is an oxidizer that may decompose when heated; nickel dust or decomposition fumes are exposure concerns.
Hazard overview: Nickel nitrite should be treated as an oxidizing solid. It can make ordinary combustibles burn faster and may decompose violently if heated or contaminated.
Response guidance: Isolate the area, remove combustibles and keep contaminated runoff out of drains. Use water spray from a safe distance to cool containers; choose extinguishing agents based on the surrounding fire and SDS.
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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
- Nickel nitrite is an oxidizer; it can intensify burning even though the material itself is not a fuel.
- Heat, shock, friction or contamination may cause rapid decomposition or explosion.
- Keep away from fuels, oils, paper, wood, clothing and other organic or reducing materials.
- Containers may rupture or explode when heated in a fire.
- Dust, solution or decomposition fumes may irritate or injure the eyes, skin and respiratory tract.
- Fire may produce toxic or irritating metal oxide and nitrogen/chlorine oxide fumes.
- Runoff can spread oxidizer contamination and increase fire or environmental hazards.
Chemical Identity & Physical Properties
Green to yellowish-green crystalline solid or powder. Odorless or slight nitrous odor at room temperature
| 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
Use SCBA for fire, dust or fume conditions with chemical-resistant clothing, gloves and eye protection; upgrade based on monitoring and SDS.
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 and the emergency response number shown on the shipping papers.
- Keep unauthorized personnel away and deny entry to the spill or fire area.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Ventilate confined spaces only if personnel are trained, equipped and monitored.
- Use the ERG, SDS, shipping papers and air monitoring to set isolation, PPE and tactical decisions.
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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 —
• Nickel nitrite is an oxidizer; it can intensify burning even though the material itself is not a fuel.
• Heat, shock, friction or contamination may cause rapid decomposition or explosion.
• Keep away from fuels, oils, paper, wood, clothing and other organic or reducing materials.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers.
• Keep unauthorized personnel away and deny entry to the spill or fire area.
• Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
• Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
SOURCE: allfirefighter.com/hazmat/un/nickel-nitrite-un-2726 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2726 Nickel nitrite Cls5 ERG140 | allfirefighter.com/hazmat/un/nickel-nitrite-un-2726SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/nickel-nitrite-un-2726
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Frequently Asked Questions about UN 2726
UN 2726 is Nickel nitrite, regulated as an oxidizing hazardous material for transport and emergency response.
The main concern is an oxidizing hazardous material behavior plus exposure risk from dust, vapor, liquid or fire products.
Approach from upwind, isolate the area, keep nonessential people out and verify the exact product with shipping papers or SDS.
Water can dissolve the material and carry oxidizer contamination. Use controlled water spray for cooling and runoff control rather than washing material into drains.
Use SCBA for fire, dust or fume conditions with chemical-resistant clothing, gloves and eye protection; upgrade based on monitoring and SDS.
It can intensify nearby fires and release toxic or irritating decomposition fumes.
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.