☣️ UN 2725 • CLASS 5
Nickel nitrate
Placard: Oxidizer. 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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Quick details
UN 2725
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
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
Chemical & Response Details
| 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 |
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
First actions (field-minded)
- 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 2725 — Nickel nitrate HAZMAT 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 —
• 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/2725 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2725 Nickel nitrate Cls5 ERG140 | ERG 140: isolate spill/leak area immediately 25-50m in all directions; if fire i | allfirefighter.com/hazmat/un/2725SMS / 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/2725
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FAQ
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; chemical-resistant gloves and suit; avoid skin contact as nickel compounds are carcinogenic and sensitizers
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.