☣️ UN 3113 • CLASS 5
UN 3113 — Organic peroxide type C, liquid, 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 3113 Quick Details
UN 3113
Product name: Organic peroxide type C, liquid, temperature controlled
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 148 (check current ERG)
Initial isolation: ERG 148: Isolate spill/leak area 50m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m in all directions; monitor temperature continuously
Common Hazards of UN 3113
- 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 | Organic peroxide type C liquidTemperature-controlled organic peroxideSelf-reactive liquid type CThermally unstable peroxide liquid |
| Appearance | Varies by specific formulation; typically clear to pale yellow liquid with characteristic peroxide odor. Temperature-sensitive organic compound requiring active refrigeration during transport and storage. |
| Flash Point | Varies by formulation; typically low flash point requiring temperature control |
| Boiling Point | Varies by formulation; decomposes before boiling |
| Vapor Density | Typically heavier than air (>1.0) |
| Water Reactivity | Generally no violent reaction with water, but may accelerate decomposition; water may dilute material and reduce concentration |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3113
Extinguishing Media
Dry chemical, CO2, water spray for cooling only; DO NOT use foam directly on material; flood with water from distance to cool containers
PPE Requirements
⚠️ Level B minimum with SCBA required; full protective clothing and face shield; thermal protective gear if fire involved; maintain safe distance during any response
Isolation & Evacuation
ERG 148: Isolate spill/leak area 50m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m in all directions; monitor temperature continuously
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 148).
First Actions for a UN 3113 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 3113 — Organic peroxide type C, liquid, temperaHAZMAT RADIO NOTE — UN 3113
Product: Organic peroxide type C, liquid, temperature controlled
Class 5 / Organic Peroxide / ERG 148
PPE: Level B minimum with SCBA required; full protective clothing and face shield; thermal protective gear if fire involved; maintain safe distance during any response
ISOLATION: ERG 148: Isolate spill/leak area 50m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m in all directions; monitor temperature continuously
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 3113 — Organic peroxide type C, liquid, temperature controlled
Class: 5 | Placard: Organic Peroxide | ERG Guide: 148
Appearance: Varies by specific formulation; typically clear to pale yellow liquid with characteristic peroxide odor. Temperature-sensitive organic compound requiring active refrigeration during transport and storage.
Water Reactivity: Generally no violent reaction with water, but may accelerate decomposition; water may dilute material and reduce concentration
Extinguishing: Dry chemical, CO2, water spray for cooling only; DO NOT use foam directly on material; flood with water from distance to cool containers
PPE: Level B minimum with SCBA required; full protective clothing and face shield; thermal protective gear if fire involved; maintain safe distance during any response
Isolation: ERG 148: Isolate spill/leak area 50m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m in all directions; monitor temperature continuously
— 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/3113 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3113 Organic peroxide type C, liquid, temperature controlled Cls5 ERG148 | allfirefighter.com/hazmat/un/3113SMS / 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/3113
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Frequently Asked Questions about UN 3113
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 protective clothing and face shield; thermal protective gear if fire involved; maintain safe distance during any response
Water reactivity: Generally no violent reaction with water, but may accelerate decomposition; water may dilute material and reduce concentration. Recommended extinguishing: Dry chemical, CO2, water spray for cooling only; DO NOT use foam directly on material; flood with water from distance to cool containers.
ERG Guide 148 recommendation: ERG 148: Isolate spill/leak area 50m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m in all directions; 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.