☣️ UN 3114 • CLASS 5
UN 3114 — Organic peroxide type C, solid, temperature controlled
Placard: Organic Peroxide. ERG Guide 148. 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 3114 Quick Details
UN 3114
Product name: Organic peroxide type C, solid, temperature controlled
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 148 (check current ERG)
Initial isolation: ERG 148: isolate 500m in all directions initially; if fire or material exposed to heat, evacuate 800m radius; maintain temperature control during transport
Common Hazards of UN 3114
- 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.
Chemical Identity & Physical Properties
| Also known as | Temperature controlled organic peroxideSelf-reactive solid type CThermally unstable peroxide solidTCOP solid |
| Appearance | Solid material, color varies by specific compound (white to pale yellow common). May be granular, powder, or crystalline. Odor varies from odorless to characteristic organic peroxide smell. |
| Flash Point | Not applicable (self-reactive material, does not require ignition source) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Generally no violent reaction with water, but contamination may accelerate decomposition and increase explosion risk |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3114
Extinguishing Media
Water spray for cooling only (from safe distance), CO2, dry chemical; DO NOT use foam directly on material
PPE Requirements
⚠️ Level A minimum for spill response; full SCBA required; thermal protective clothing if fire involved; maintain safe distance due to explosion potential
Isolation & Evacuation
ERG 148: isolate 500m in all directions initially; if fire or material exposed to heat, evacuate 800m radius; maintain temperature control during transport
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 148).
First Actions for a UN 3114 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 3114 — Organic peroxide type C, solid, temperatHAZMAT RADIO NOTE — UN 3114
Product: Organic peroxide type C, solid, temperature controlled
Class 5 / Organic Peroxide / ERG 148
PPE: Level A minimum for spill response; full SCBA required; thermal protective clothing if fire involved; maintain safe distance due to explosion potential
ISOLATION: ERG 148: isolate 500m in all directions initially; if fire or material exposed to heat, evacuate 800m radius; maintain temperature control during transport
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 3114 — Organic peroxide type C, solid, temperature controlled
Class: 5 | Placard: Organic Peroxide | ERG Guide: 148
Appearance: Solid material, color varies by specific compound (white to pale yellow common). May be granular, powder, or crystalline. Odor varies from odorless to characteristic organic peroxide smell.
Water Reactivity: Generally no violent reaction with water, but contamination may accelerate decomposition and increase explosion risk
Extinguishing: Water spray for cooling only (from safe distance), CO2, dry chemical; DO NOT use foam directly on material
PPE: Level A minimum for spill response; full SCBA required; thermal protective clothing if fire involved; maintain safe distance due to explosion potential
Isolation: ERG 148: isolate 500m in all directions initially; if fire or material exposed to heat, evacuate 800m radius; maintain temperature control during transport
— 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/3114 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3114 Organic peroxide type C, solid, temperature controlled Cls5 ERG148 | allfirefighter.com/hazmat/un/3114SMS / 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/3114
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Frequently Asked Questions about UN 3114
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 A minimum for spill response; full SCBA required; thermal protective clothing if fire involved; maintain safe distance due to explosion potential
Water reactivity: Generally no violent reaction with water, but contamination may accelerate decomposition and increase explosion risk. Recommended extinguishing: Water spray for cooling only (from safe distance), CO2, dry chemical; DO NOT use foam directly on material.
ERG Guide 148 recommendation: ERG 148: isolate 500m in all directions initially; if fire or material exposed to heat, evacuate 800m radius; maintain temperature control during transport
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.