☣️ UN 2547 • CLASS 5
UN 2547 — Sodium superoxide
Placard: Oxidizer. ERG Guide 143. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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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UN 2547 Quick Details
UN 2547
Product name: Sodium superoxide
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 143 (check current ERG)
Initial isolation: ERG 143: Initial isolation 100m in all directions. Protective action distance: 300m downwind for small spills, 800m for large spills or fire.
Common Hazards of UN 2547
- May explode from friction, heat or contamination.
- These substances will accelerate burning when involved in a fire.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Some will react explosively with hydrocarbons (fuels).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe
- Fire may produce irritating and/or toxic gases.
Chemical Identity & Physical Properties
| Also known as | Sodium peroxideSodium dioxideDisodium dioxideSodium hyperoxide |
| CAS Number | 12401-86-4 |
| Appearance | Yellow to white granular powder or pellets. Odorless. Solid at room temperature. |
| Flash Point | Not applicable (oxidizer, not flammable itself) |
| Boiling Point | Decomposes at 657C (1215F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts violently with water producing heat, oxygen, and corrosive sodium hydroxide solution. Do not use water directly on material. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2547
Extinguishing Media
Dry sand, dry chemical, soda ash. Do NOT use water, foam, CO2, or halogenated agents.
PPE Requirements
⚠️ Level B minimum with full face SCBA. Chemical-resistant suit required. Avoid all contact - highly corrosive and reactive.
Isolation & Evacuation
ERG 143: Initial isolation 100m in all directions. Protective action distance: 300m downwind for small spills, 800m for large spills or fire.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 143).
First Actions for a UN 2547 Incident
- 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
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 2547 — Sodium superoxideHAZMAT RADIO NOTE — UN 2547
Product: Sodium superoxide
Class 5 / Oxidizer / ERG 143
PPE: Level B minimum with full face SCBA. Chemical-resistant suit required. Avoid all contact - highly corrosive and reactive.
ISOLATION: ERG 143: Initial isolation 100m in all directions. Protective action distance: 300m downwind for small spills, 800m for large spills or fire.
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 2547 — Sodium superoxide
Class: 5 | Placard: Oxidizer | ERG Guide: 143
Appearance: Yellow to white granular powder or pellets. Odorless. Solid at room temperature.
Water Reactivity: Reacts violently with water producing heat, oxygen, and corrosive sodium hydroxide solution. Do not use water directly on material.
Extinguishing: Dry sand, dry chemical, soda ash. Do NOT use water, foam, CO2, or halogenated agents.
PPE: Level B minimum with full face SCBA. Chemical-resistant suit required. Avoid all contact - highly corrosive and reactive.
Isolation: ERG 143: Initial isolation 100m in all directions. Protective action distance: 300m downwind for small spills, 800m for large spills or fire.
— Key Hazards —
• May explode from friction, heat or contamination.
• These substances will accelerate burning when involved in a fire.
• May ignite combustibles (wood, paper, oil, clothing, etc.).
— 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/2547 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2547 Sodium superoxide Cls5 ERG143 | ERG 143: Initial isolation 100m in all directions. Protective action distance: 3 | allfirefighter.com/hazmat/un/2547SMS / 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/2547
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Frequently Asked Questions about UN 2547
May explode from friction, heat or contamination. These substances will accelerate burning when involved in a fire. May ignite combustibles (wood, paper, oil, clothing, etc.). Some will react explosively with hydrocarbons (fuels). Containers may explode when heated. Runoff may create fire or explosion hazard. TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe Fire may produce irritating and/or toxic gases.
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 SCBA. Chemical-resistant suit required. Avoid all contact - highly corrosive and reactive.
Water reactivity: Reacts violently with water producing heat, oxygen, and corrosive sodium hydroxide solution. Do not use water directly on material.. Recommended extinguishing: Dry sand, dry chemical, soda ash. Do NOT use water, foam, CO2, or halogenated agents..
ERG Guide 143 recommendation: ERG 143: Initial isolation 100m in all directions. Protective action distance: 300m downwind for small spills, 800m for large spills or fire.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 143 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.