☣️ UN 3104 • CLASS 5
UN 3104 — Organic peroxide type C, solid
Placard: Organic Peroxide. ERG Guide 146. 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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UN 3104 Quick Details
UN 3104
Product name: Organic peroxide type C, solid
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 146 (check current ERG)
Initial isolation: ERG 146: Initially isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation for that distance
Common Hazards of UN 3104
- May explode from heat, shock, friction or contamination.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- May be ignited by heat, sparks or flames.
- May burn rapidly with flare-burning effect.
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Fire may produce irritating, corrosive and/or toxic gases.
- Ingestion or contact (skin, eyes) with substance may cause severe injury or burns.
Chemical Identity & Physical Properties
| Also known as | Organic peroxide type C solidClass 5.2 organic peroxideSelf-reactive solid type CPeroxide compound solid |
| Appearance | Typically a white to off-white crystalline or granular solid. May be odorless or have a slight chemical odor. Physical appearance varies depending on specific compound, as this is a classification covering multiple organic peroxides. |
| Flash Point | Not applicable (self-reactive solid that can decompose explosively) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Generally no significant reaction with water, but water may not effectively control decomposition or fires |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3104
Extinguishing Media
Dry chemical, CO2, or water spray from distance; foam may be ineffective; avoid directing water stream directly onto material
PPE Requirements
⚠️ Level B minimum required; SCBA and full protective clothing mandatory; face shield and thermal protection for fire fighting; evacuation of non-essential personnel
Isolation & Evacuation
ERG 146: Initially isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation for that distance
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 146).
First Actions for a UN 3104 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.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial evacuation for at least 250 meters (800 feet) in all directions.
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📋 Copy & Share Field Card
UN 3104 — Organic peroxide type C, solidHAZMAT RADIO NOTE — UN 3104
Product: Organic peroxide type C, solid
Class 5 / Organic Peroxide / ERG 146
PPE: Level B minimum required; SCBA and full protective clothing mandatory; face shield and thermal protection for fire fighting; evacuation of non-essential personnel
ISOLATION: ERG 146: Initially isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation for that distance
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 3104 — Organic peroxide type C, solid
Class: 5 | Placard: Organic Peroxide | ERG Guide: 146
Appearance: Typically a white to off-white crystalline or granular solid. May be odorless or have a slight chemical odor. Physical appearance varies depending on specific compound, as this is a classification covering multiple organic peroxides.
Water Reactivity: Generally no significant reaction with water, but water may not effectively control decomposition or fires
Extinguishing: Dry chemical, CO2, or water spray from distance; foam may be ineffective; avoid directing water stream directly onto material
PPE: Level B minimum required; SCBA and full protective clothing mandatory; face shield and thermal protection for fire fighting; evacuation of non-essential personnel
Isolation: ERG 146: Initially isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation for that distance
— Key Hazards —
• May explode from heat, shock, friction or contamination.
• May ignite combustibles (wood, paper, oil, clothing, etc.).
• May be ignited by heat, sparks or flames.
— 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.
• 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/3104 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3104 Organic peroxide type C, solid Cls5 ERG146 | allfirefighter.com/hazmat/un/3104SMS / 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/3104
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Frequently Asked Questions about UN 3104
May explode from heat, shock, friction or contamination. May ignite combustibles (wood, paper, oil, clothing, etc.). May be ignited by heat, sparks or flames. May burn rapidly with flare-burning effect. Containers may explode when heated. Runoff may create fire or explosion hazard. Fire may produce irritating, corrosive and/or toxic gases. Ingestion or contact (skin, eyes) with substance may cause severe injury or burns.
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 required; SCBA and full protective clothing mandatory; face shield and thermal protection for fire fighting; evacuation of non-essential personnel
Water reactivity: Generally no significant reaction with water, but water may not effectively control decomposition or fires. Recommended extinguishing: Dry chemical, CO2, or water spray from distance; foam may be ineffective; avoid directing water stream directly onto material.
ERG Guide 146 recommendation: ERG 146: Initially isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation for that distance
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 146 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.