☣️ UN 3107 • CLASS 5
Organic peroxide type E, liquid
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 3107
Class: 5
Placard type: Organic Peroxide
ERG: Guide 145 (check current ERG)
Isolation: ERG 145: Isolate 100m (330 ft) in all directions initially; if tank/railcar involved in fire, isolate 800m (1/2 mile) radius and evacuate
Chemical & Response Details
| Also known as | Organic peroxide type E liquidClass 5.2 organic peroxideSelf-reactive substance type EPeroxide compound liquid |
| Appearance | Varies by specific formulation; typically colorless to pale yellow liquid with mild to pungent odor. Organic peroxides are thermally unstable oxidizing agents at ambient temperature. |
| Flash Point | Varies by formulation; typically 60°C (140°F) or higher for Type E |
| Boiling Point | Varies by specific peroxide compound; typically 100-200°C (212-392°F) |
| Vapor Density | Greater than 1 (heavier than air) for most organic peroxide liquids |
| Water Reactivity | Generally no violent reaction with water, but avoid contamination; some may slowly decompose in water |
| Extinguishing | Alcohol-resistant foam preferred; water spray for cooling only; avoid direct water streams on product |
| PPE | ⚠️ Level B minimum with SCBA; chemical-resistant suit; avoid all ignition sources; organic peroxides can detonate |
| Isolation | ERG 145: Isolate 100m (330 ft) in all directions initially; if tank/railcar involved in fire, isolate 800m (1/2 mile) radius and evacuate |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- May explode from heat 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.
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 3107 — Organic peroxide type E, liquid HAZMAT RADIO NOTE — UN 3107
Product: Organic peroxide type E, liquid
Class 5 / Organic Peroxide / ERG 145
PPE: Level B minimum with SCBA; chemical-resistant suit; avoid all ignition sources; organic peroxides can detonate
ISOLATION: ERG 145: Isolate 100m (330 ft) in all directions initially; if tank/railcar involved in fire, isolate 800m (1/2 mile) radius and evacuate
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 3107 — Organic peroxide type E, liquid
Class: 5 | Placard: Organic Peroxide | ERG Guide: 145
Appearance: Varies by specific formulation; typically colorless to pale yellow liquid with mild to pungent odor. Organic peroxides are thermally unstable oxidizing agents at ambient temperature.
Water Reactivity: Generally no violent reaction with water, but avoid contamination; some may slowly decompose in water
Extinguishing: Alcohol-resistant foam preferred; water spray for cooling only; avoid direct water streams on product
PPE: Level B minimum with SCBA; chemical-resistant suit; avoid all ignition sources; organic peroxides can detonate
Isolation: ERG 145: Isolate 100m (330 ft) in all directions initially; if tank/railcar involved in fire, isolate 800m (1/2 mile) radius and evacuate
— Key Hazards —
• May explode from heat 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/3107 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3107 Organic peroxide type E, liquid Cls5 ERG145 | allfirefighter.com/hazmat/un/3107SMS / 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/3107
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FAQ
May explode from heat 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 with SCBA; chemical-resistant suit; avoid all ignition sources; organic peroxides can detonate
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 145 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.