☣️ UN 2725 • CLASS 5
UN 2725 — Nickel nitrate
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 2725 At a Glance
UN 2725 (Nickel nitrate) 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 nitrate is an oxidizer and nickel compound; prevent dust exposure and keep it away from fuels or reducing agents.
Hazard overview: Nickel nitrate 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 2725 Quick Details
UN 2725
Product name: Nickel nitrate
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill/leak area immediately 25-50m in all directions; if fire involved, isolate 800m in all directions; evacuate area and deny entry
Common Hazards of UN 2725
- Nickel nitrate 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 crystalline solid or solution, typically found as hexahydrate form. Odorless. Deliquescent crystals that readily absorb moisture from air
| Also known as | Nickel(II) nitrateNickelous nitrateNickel dinitrateNickel nitrate hexahydrate |
| CAS Number | 13138-45-9 |
| Appearance | Green crystalline solid or solution, typically found as hexahydrate form. Odorless. Deliquescent crystals that readily absorb moisture from air. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes above 56.7C/134F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Readily soluble in water; no violent reaction but releases heat upon dissolution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2725
Extinguishing Media
Water spray, dry chemical, CO2; avoid organic materials and combustibles
PPE Requirements
⚠️ Level B minimum with SCBA; chemical-resistant gloves and suit; avoid skin contact as nickel compounds are carcinogenic and sensitizers
Use SCBA and chemical-resistant clothing; prevent nickel dust contact and decontaminate responders and equipment.
Isolation & Evacuation
ERG 140: isolate spill/leak area immediately 25-50m in all directions; if fire involved, isolate 800m in all directions; evacuate area and deny entry
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2725 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 2725 — Nickel nitrateHAZMAT RADIO NOTE — UN 2725
Product: Nickel nitrate
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with SCBA; chemical-resistant gloves and suit; avoid skin contact as nickel compounds are carcinogenic and sensitizers
ISOLATION: ERG 140: isolate spill/leak area immediately 25-50m in all directions; if fire involved, isolate 800m in all directions; evacuate area and deny entry
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 2725 — Nickel nitrate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Green crystalline solid or solution, typically found as hexahydrate form. Odorless. Deliquescent crystals that readily absorb moisture from air.
Water Reactivity: Readily soluble in water; no violent reaction but releases heat upon dissolution
Extinguishing: Water spray, dry chemical, CO2; avoid organic materials and combustibles
PPE: Level B minimum with SCBA; chemical-resistant gloves and suit; avoid skin contact as nickel compounds are carcinogenic and sensitizers
Isolation: ERG 140: isolate spill/leak area immediately 25-50m in all directions; if fire involved, isolate 800m in all directions; evacuate area and deny entry
— Key Hazards —
• Nickel nitrate 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-nitrate-un-2725 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2725 Nickel nitrate Cls5 ERG140 | allfirefighter.com/hazmat/un/nickel-nitrate-un-2725SMS / 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-nitrate-un-2725
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Frequently Asked Questions about UN 2725
UN 2725 is Nickel nitrate, 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 and chemical-resistant clothing; prevent nickel dust contact and decontaminate responders and equipment.
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.