☣️ UN 3116 • CLASS 5
UN 3116 — Organic peroxide type D, 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 3116 Quick Details
UN 3116
Product name: Organic peroxide type D, solid, temperature controlled
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 148 (check current ERG)
Initial isolation: ERG 148: Isolate spill area immediately for at least 50 meters in all directions; if tank/railcar involved in fire, isolate 800 meters in all directions; evacuate area and fight fire from maximum distance
Common Hazards of UN 3116
- 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 D solid temperature controlledTemperature-controlled organic peroxide solidClass 5.2 organic peroxide type DSelf-reactive solid type D |
| Appearance | Solid material, color and appearance varies depending on specific formulation. Organic peroxides are temperature-sensitive oxidizing materials that require controlled storage conditions to prevent decomposition or explosive reaction. |
| Flash Point | Not applicable (organic peroxide - decomposes/explodes rather than flashes) |
| Boiling Point | Not applicable (solid organic peroxide decomposes before boiling) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | May react with water depending on formulation; contact with moisture can accelerate decomposition |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3116
Extinguishing Media
Do not use water or foam; use dry chemical, CO2, or sand for small fires; withdraw and let large fires burn
PPE Requirements
⚠️ Level B minimum with SCBA required; full protective clothing and equipment; avoid all sources of ignition and heat
Isolation & Evacuation
ERG 148: Isolate spill area immediately for at least 50 meters in all directions; if tank/railcar involved in fire, isolate 800 meters in all directions; evacuate area and fight fire from maximum distance
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 148).
First Actions for a UN 3116 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 3116 — Organic peroxide type D, solid, temperatHAZMAT RADIO NOTE — UN 3116
Product: Organic peroxide type D, solid, temperature controlled
Class 5 / Organic Peroxide / ERG 148
PPE: Level B minimum with SCBA required; full protective clothing and equipment; avoid all sources of ignition and heat
ISOLATION: ERG 148: Isolate spill area immediately for at least 50 meters in all directions; if tank/railcar involved in fire, isolate 800 meters in all directions; evacuate area and fight fire from maximum 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 3116 — Organic peroxide type D, solid, temperature controlled
Class: 5 | Placard: Organic Peroxide | ERG Guide: 148
Appearance: Solid material, color and appearance varies depending on specific formulation. Organic peroxides are temperature-sensitive oxidizing materials that require controlled storage conditions to prevent decomposition or explosive reaction.
Water Reactivity: May react with water depending on formulation; contact with moisture can accelerate decomposition
Extinguishing: Do not use water or foam; use dry chemical, CO2, or sand for small fires; withdraw and let large fires burn
PPE: Level B minimum with SCBA required; full protective clothing and equipment; avoid all sources of ignition and heat
Isolation: ERG 148: Isolate spill area immediately for at least 50 meters in all directions; if tank/railcar involved in fire, isolate 800 meters in all directions; evacuate area and fight fire from maximum distance
— 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/3116 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3116 Organic peroxide type D, solid, temperature controlled Cls5 ERG148 | allfirefighter.com/hazmat/un/3116SMS / 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/3116
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Frequently Asked Questions about UN 3116
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 equipment; avoid all sources of ignition and heat
Water reactivity: May react with water depending on formulation; contact with moisture can accelerate decomposition. Recommended extinguishing: Do not use water or foam; use dry chemical, CO2, or sand for small fires; withdraw and let large fires burn.
ERG Guide 148 recommendation: ERG 148: Isolate spill area immediately for at least 50 meters in all directions; if tank/railcar involved in fire, isolate 800 meters in all directions; evacuate area and fight fire from maximum distance
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.