☣️ UN 1466 • CLASS 5
Ferric 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 1466
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m and consider evacuation 800m.
Chemical & Response Details
| Also known as | Iron(III) nitrateNitric acid iron(III) saltFerric nitrate nonahydrateIron trinitrate |
| CAS Number | 10421-48-4 |
| Appearance | Pale violet to white crystalline solid or powder. Hygroscopic (absorbs moisture from air). Odorless. |
| Flash Point | Not applicable (non-flammable oxidizer) |
| Boiling Point | Not applicable (decomposes at 125C/257F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water, exothermic dissolution produces heat. Acidic aqueous solution. |
| Extinguishing | Water spray, dry chemical, CO2. Avoid organic materials near fire. |
| PPE | ⚠️ Level B minimum with full-face respirator. SCBA if fire or decomposition gases present. Neoprene or nitrile gloves. |
| Isolation | ERG 140: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m and consider evacuation 800m. |
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 1466 — Ferric nitrate HAZMAT RADIO NOTE — UN 1466
Product: Ferric nitrate
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with full-face respirator. SCBA if fire or decomposition gases present. Neoprene or nitrile gloves.
ISOLATION: ERG 140: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m and consider evacuation 800m.
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 1466 — Ferric nitrate
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Pale violet to white crystalline solid or powder. Hygroscopic (absorbs moisture from air). Odorless.
Water Reactivity: Soluble in water, exothermic dissolution produces heat. Acidic aqueous solution.
Extinguishing: Water spray, dry chemical, CO2. Avoid organic materials near fire.
PPE: Level B minimum with full-face respirator. SCBA if fire or decomposition gases present. Neoprene or nitrile gloves.
Isolation: ERG 140: isolate 25m in all directions initially. If tank/rail car involved in fire, isolate 800m and consider evacuation 800m.
— 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/1466 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1466 Ferric nitrate Cls5 ERG140 | ERG 140: isolate 25m in all directions initially. If tank/rail car involved in f | allfirefighter.com/hazmat/un/1466SMS / 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/1466
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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 full-face respirator. SCBA if fire or decomposition gases present. Neoprene or nitrile gloves.
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.