☣️ UN 1511 • CLASS 5
UN 1511 — Urea hydrogen peroxide
Placard: Oxidizer. ERG Guide 140. 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 1511 Quick Details
UN 1511
Product name: Urea hydrogen peroxide
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: Isolate spill 25-50m in all directions; if fire or large spill, isolate 800m and consider evacuation 1600m downwind
Common Hazards of UN 1511
- 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
| Also known as | Carbamide peroxideUrea peroxidePercarbamideHyperolHydrogen peroxide-urea adduct |
| CAS Number | 124-43-6 |
| Appearance | White crystalline powder or granules with a slight characteristic odor. Stable at room temperature when dry. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Decomposes at approximately 75-85C (167-185F) releasing oxygen and heat |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Slowly decomposes in water releasing oxygen and hydrogen peroxide; reaction is not violent but generates heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1511
Extinguishing Media
Water spray for cooling, dry chemical, carbon dioxide; avoid organic materials and combustibles
PPE Requirements
⚠️ Level C minimum with full face respirator; Level B if airborne dust or decomposition; chemical-resistant gloves and eye protection mandatory
Isolation & Evacuation
ERG 140: Isolate spill 25-50m in all directions; if fire or large spill, isolate 800m and consider evacuation 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 1511 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
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 1511 — Urea hydrogen peroxideHAZMAT RADIO NOTE — UN 1511
Product: Urea hydrogen peroxide
Class 5 / Oxidizer / ERG 140
PPE: Level C minimum with full face respirator; Level B if airborne dust or decomposition; chemical-resistant gloves and eye protection mandatory
ISOLATION: ERG 140: Isolate spill 25-50m in all directions; if fire or large spill, isolate 800m and consider evacuation 1600m downwind
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 1511 — Urea hydrogen peroxide
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White crystalline powder or granules with a slight characteristic odor. Stable at room temperature when dry.
Water Reactivity: Slowly decomposes in water releasing oxygen and hydrogen peroxide; reaction is not violent but generates heat
Extinguishing: Water spray for cooling, dry chemical, carbon dioxide; avoid organic materials and combustibles
PPE: Level C minimum with full face respirator; Level B if airborne dust or decomposition; chemical-resistant gloves and eye protection mandatory
Isolation: ERG 140: Isolate spill 25-50m in all directions; if fire or large spill, isolate 800m and consider evacuation 1600m downwind
— 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/1511 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1511 Urea hydrogen peroxide Cls5 ERG140 | ERG 140: Isolate spill 25-50m in all directions; if fire or large spill, isolate | allfirefighter.com/hazmat/un/1511SMS / 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/1511
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Frequently Asked Questions about UN 1511
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 C minimum with full face respirator; Level B if airborne dust or decomposition; chemical-resistant gloves and eye protection mandatory
Water reactivity: Slowly decomposes in water releasing oxygen and hydrogen peroxide; reaction is not violent but generates heat. Recommended extinguishing: Water spray for cooling, dry chemical, carbon dioxide; avoid organic materials and combustibles.
ERG Guide 140 recommendation: ERG 140: Isolate spill 25-50m in all directions; if fire or large spill, isolate 800m and consider evacuation 1600m downwind
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.