☣️ UN 3109 • CLASS 5
Organic peroxide type F, 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 3109
Class: 5
Placard type: Organic Peroxide
ERG: Guide 145 (check current ERG)
Isolation: ERG 145: isolate spill/leak area 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions; evacuate immediate area
Chemical & Response Details
| Also known as | Organic peroxide type F liquidClass 5.2 organic peroxideLiquid organic peroxide formulationPeroxide solution type F |
| Appearance | Variable appearance depending on formulation; typically clear to pale yellow liquid with mild to strong characteristic odor. Room temperature stable liquid peroxide mixture. |
| Flash Point | Variable, typically >60°C (140°F) for Type F formulations |
| Boiling Point | Variable depending on carrier solvent, typically 100-200°C (212-392°F) |
| Vapor Density | Typically >1 (heavier than air), varies with formulation |
| Water Reactivity | No significant reaction with water, though may decompose slowly in presence of moisture |
| Extinguishing | Alcohol-resistant foam preferred; avoid standard protein foam; dry chemical acceptable; flooding quantities of water for cooling |
| PPE | ⚠️ Level B minimum with SCBA required; face shield and chemical-resistant suit; avoid all sources of ignition and contamination |
| Isolation | ERG 145: isolate spill/leak area 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions; evacuate immediate area |
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 3109 — Organic peroxide type F, liquid HAZMAT RADIO NOTE — UN 3109
Product: Organic peroxide type F, liquid
Class 5 / Organic Peroxide / ERG 145
PPE: Level B minimum with SCBA required; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
ISOLATION: ERG 145: isolate spill/leak area 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions; evacuate immediate area
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 3109 — Organic peroxide type F, liquid
Class: 5 | Placard: Organic Peroxide | ERG Guide: 145
Appearance: Variable appearance depending on formulation; typically clear to pale yellow liquid with mild to strong characteristic odor. Room temperature stable liquid peroxide mixture.
Water Reactivity: No significant reaction with water, though may decompose slowly in presence of moisture
Extinguishing: Alcohol-resistant foam preferred; avoid standard protein foam; dry chemical acceptable; flooding quantities of water for cooling
PPE: Level B minimum with SCBA required; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
Isolation: ERG 145: isolate spill/leak area 50m in all directions; if tank/rail car involved in fire, isolate 800m in all directions; evacuate immediate area
— 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/3109 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3109 Organic peroxide type F, liquid Cls5 ERG145 | allfirefighter.com/hazmat/un/3109SMS / 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/3109
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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 required; face shield and chemical-resistant suit; avoid all sources of ignition and contamination
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.