☣️ UN 1477 • CLASS 5
UN 1477 — Nitrates, inorganic, n.o.s.
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.
Nitrates, inorganic, n.o.s. are typically white to colorless crystalline solids or powders with a generally odorless appearance. They vary in appearance depending on the specific metal nitrate compound.
Hazard overview: These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire.
Response guidance: Use dry chemical, sand, or dry earth to extinguish fires. Isolate the spill area at least 25-50m and consider evacuation if necessary.
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UN 1477 Quick Details
UN 1477
Product name: Nitrates, inorganic, n.o.s.
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 25-50m all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 800m in all directions
Common Hazards of UN 1477
- 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
Typically white to colorless crystalline solids or powders. Generally odorless. Appearance varies depending on specific metal nitrate compound.
| Also known as | Inorganic nitrate saltsMetal nitrates n.o.s.Nitrate compoundsOxidizing nitrate salts |
| Appearance | Typically white to colorless crystalline solids or powders. Generally odorless. Appearance varies depending on specific metal nitrate compound. |
| Flash Point | Not applicable (oxidizing solid, not flammable itself) |
| Boiling Point | Varies by compound; most decompose before boiling, typically 400-600C (752-1112F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Most are water soluble; no violent reaction but dissolution may generate heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1477
Extinguishing Media
Do not use water or foam on fires; use dry chemical, sand, or dry earth only
PPE Requirements
⚠️ Level B minimum for spills; SCBA and full protective clothing required for fire situations; avoid dust inhalation
Level B minimum for spills; SCBA and full protective clothing required for fire situations; avoid dust inhalation
Isolation & Evacuation
ERG 140: isolate spill 25-50m all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 1477 Incident
- 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 1477 — Nitrates, inorganic, n.o.s.HAZMAT RADIO NOTE — UN 1477
Product: Nitrates, inorganic, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum for spills; SCBA and full protective clothing required for fire situations; avoid dust inhalation
ISOLATION: ERG 140: isolate spill 25-50m all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 800m in all directions
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 1477 — Nitrates, inorganic, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Typically white to colorless crystalline solids or powders. Generally odorless. Appearance varies depending on specific metal nitrate compound.
Water Reactivity: Most are water soluble; no violent reaction but dissolution may generate heat
Extinguishing: Do not use water or foam on fires; use dry chemical, sand, or dry earth only
PPE: Level B minimum for spills; SCBA and full protective clothing required for fire situations; avoid dust inhalation
Isolation: ERG 140: isolate spill 25-50m all directions; if tank/cargo involved in fire, isolate 800m and consider evacuation 800m in all directions
— 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 —
• 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
SOURCE: allfirefighter.com/hazmat/un/nitrates-inorganic-n-o-un-1477 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1477 Nitrates, inorganic, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/nitrates-inorganic-n-o-un-1477SMS / 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/nitrates-inorganic-n-o-un-1477
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Frequently Asked Questions about UN 1477
No, UN 1477 is a Class 5 oxidizer that accelerates burning but is not flammable itself.
Use dry chemical, sand, or dry earth to extinguish fires and isolate the spill area at least 25-50m.
Yes, most are water soluble, but dissolution may generate heat.
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.