☣️ UN 3108 • CLASS 5
UN 3108 — Organic peroxide type E, solid
Placard: Organic Peroxide. ERG Guide 145. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
UN 3108 Quick Details
UN 3108
Product name: Organic peroxide type E, solid
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 145 (check current ERG)
Initial isolation: ERG 145: Isolate spill area immediate 25m (75 ft) all directions. For large spills consider initial downwind evacuation 300m (1000 ft). If fire or explosion, isolate 800m (0.5 mile) radius.
Common Hazards of UN 3108
- 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.
Chemical Identity & Physical Properties
| Also known as | Organic peroxide type E solidClass 5.2 organic peroxide solidSelf-reactive peroxide compound solidPeroxy compound type E |
| Appearance | Varies by specific compound; typically white to off-white crystalline or granular solid at room temperature. May have slight characteristic organic odor. Type E peroxides are relatively stable but still require temperature control. |
| Flash Point | Not applicable (organic peroxide - self-reactive) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally minimal reaction with water, though some organic peroxides may decompose slowly in water. Avoid contamination. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3108
Extinguishing Media
Water spray to cool containers, dry chemical, CO2. Avoid contamination of product. Do not use direct water stream on material.
PPE Requirements
⚠️ Level B minimum with SCBA required. Full face shield, chemical-resistant suit. Avoid all sources of ignition and contamination. Temperature control critical.
Isolation & Evacuation
ERG 145: Isolate spill area immediate 25m (75 ft) all directions. For large spills consider initial downwind evacuation 300m (1000 ft). If fire or explosion, isolate 800m (0.5 mile) radius.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 145).
First Actions for a UN 3108 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.
Advertisement
📋 Copy & Share Field Card
UN 3108 — Organic peroxide type E, solidHAZMAT RADIO NOTE — UN 3108
Product: Organic peroxide type E, solid
Class 5 / Organic Peroxide / ERG 145
PPE: Level B minimum with SCBA required. Full face shield, chemical-resistant suit. Avoid all sources of ignition and contamination. Temperature control critical.
ISOLATION: ERG 145: Isolate spill area immediate 25m (75 ft) all directions. For large spills consider initial downwind evacuation 300m (1000 ft). If fire or explosion, isolate 800m (0.5 mile) radius.
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 3108 — Organic peroxide type E, solid
Class: 5 | Placard: Organic Peroxide | ERG Guide: 145
Appearance: Varies by specific compound; typically white to off-white crystalline or granular solid at room temperature. May have slight characteristic organic odor. Type E peroxides are relatively stable but still require temperature control.
Water Reactivity: Generally minimal reaction with water, though some organic peroxides may decompose slowly in water. Avoid contamination.
Extinguishing: Water spray to cool containers, dry chemical, CO2. Avoid contamination of product. Do not use direct water stream on material.
PPE: Level B minimum with SCBA required. Full face shield, chemical-resistant suit. Avoid all sources of ignition and contamination. Temperature control critical.
Isolation: ERG 145: Isolate spill area immediate 25m (75 ft) all directions. For large spills consider initial downwind evacuation 300m (1000 ft). If fire or explosion, isolate 800m (0.5 mile) radius.
— 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/3108 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3108 Organic peroxide type E, solid Cls5 ERG145 | allfirefighter.com/hazmat/un/3108SMS / 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/3108
Advertisement
Frequently Asked Questions about UN 3108
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 required. Full face shield, chemical-resistant suit. Avoid all sources of ignition and contamination. Temperature control critical.
Water reactivity: Generally minimal reaction with water, though some organic peroxides may decompose slowly in water. Avoid contamination.. Recommended extinguishing: Water spray to cool containers, dry chemical, CO2. Avoid contamination of product. Do not use direct water stream on material..
ERG Guide 145 recommendation: ERG 145: Isolate spill area immediate 25m (75 ft) all directions. For large spills consider initial downwind evacuation 300m (1000 ft). If fire or explosion, isolate 800m (0.5 mile) radius.
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.