☣️ UN 3118 • CLASS 5
Organic peroxide type E, solid, temperature controlled
Placard: Organic Peroxide. 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 3118
Class: 5
Placard type: Organic Peroxide
ERG: Guide 148 (check current ERG)
Isolation: ERG 148: Initial isolation 100m in all directions. Protect from heat, open flames, and contamination. Evacuate 800m downwind if fire involves cargo. Maintain temperature control to prevent runaway decomposition.
Chemical & Response Details
| Also known as | Organic peroxide type E solidTemperature-controlled organic peroxide solidSelf-reactive substance type EThermally unstable peroxide solid |
| Appearance | Typically white to off-white crystalline or granular solid at room temperature. May be odorless or have a characteristic sharp, acrid odor. Requires temperature control during transport to prevent decomposition. |
| Flash Point | Not applicable (self-reactive solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally no violent reaction with water, but water may accelerate decomposition and heat generation. Avoid large quantities of water. |
| Extinguishing | Dry chemical, CO2, or dry sand preferred. Water fog may be used for cooling from distance. Avoid foam unless specifically approved. |
| PPE | ⚠️ Level B minimum with SCBA required. Full face shield, chemical-resistant suit. Maintain distance due to explosion hazard. Monitor temperature continuously. |
| Isolation | ERG 148: Initial isolation 100m in all directions. Protect from heat, open flames, and contamination. Evacuate 800m downwind if fire involves cargo. Maintain temperature control to prevent runaway decomposition. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- May explode from heat, contamination or loss of temperature control.
- These materials are particularly sensitive to temperature rises. Above a given "Control Temperature"
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- May ignite spontaneously if exposed to air.
- 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.
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.
- 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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UN 3118 — Organic peroxide type E, solid, temperat HAZMAT RADIO NOTE — UN 3118
Product: Organic peroxide type E, solid, temperature controlled
Class 5 / Organic Peroxide / ERG 148
PPE: Level B minimum with SCBA required. Full face shield, chemical-resistant suit. Maintain distance due to explosion hazard. Monitor temperature continuously.
ISOLATION: ERG 148: Initial isolation 100m in all directions. Protect from heat, open flames, and contamination. Evacuate 800m downwind if fire involves cargo. Maintain temperature control to prevent runaway decomposition.
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 3118 — Organic peroxide type E, solid, temperature controlled
Class: 5 | Placard: Organic Peroxide | ERG Guide: 148
Appearance: Typically white to off-white crystalline or granular solid at room temperature. May be odorless or have a characteristic sharp, acrid odor. Requires temperature control during transport to prevent decomposition.
Water Reactivity: Generally no violent reaction with water, but water may accelerate decomposition and heat generation. Avoid large quantities of water.
Extinguishing: Dry chemical, CO2, or dry sand preferred. Water fog may be used for cooling from distance. Avoid foam unless specifically approved.
PPE: Level B minimum with SCBA required. Full face shield, chemical-resistant suit. Maintain distance due to explosion hazard. Monitor temperature continuously.
Isolation: ERG 148: Initial isolation 100m in all directions. Protect from heat, open flames, and contamination. Evacuate 800m downwind if fire involves cargo. Maintain temperature control to prevent runaway decomposition.
— Key Hazards —
• May explode from heat, contamination or loss of temperature control.
• These materials are particularly sensitive to temperature rises. Above a given "Control Temperature"
• 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.
• 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/3118 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3118 Organic peroxide type E, solid, temperature controlled Cls5 ERG148 | allfirefighter.com/hazmat/un/3118SMS / 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/3118
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FAQ
May explode from heat, contamination or loss of temperature control. These materials are particularly sensitive to temperature rises. Above a given "Control Temperature" May ignite combustibles (wood, paper, oil, clothing, etc.). May ignite spontaneously if exposed to air. 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.
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 SCBA required. Full face shield, chemical-resistant suit. Maintain distance due to explosion hazard. Monitor temperature continuously.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 148 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.