☣️ UN 3105 • CLASS 5
UN 3105 — Organic peroxide type D, liquid
Placard: Organic Peroxide. ERG Guide 145. 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 3105 Quick Details
UN 3105
Product name: Organic peroxide type D, liquid
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 145 (check current ERG)
Initial isolation: ERG 145: Isolate spill 50m all directions; if fire or large spill isolate 800m initially, protect downwind 1600m
Common Hazards of UN 3105
- 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 solutionPeroxide compound liquidOPDT liquidType D peroxide |
| Appearance | Clear to colored liquid depending on formulation. Odor varies by specific peroxide compound. May be viscous or thin liquid at room temperature. |
| Flash Point | Varies by formulation, typically 60-93C (140-200F) |
| Boiling Point | Varies by formulation, typically 100-200C (212-392F) |
| Vapor Density | Greater than 1 (heavier than air) |
| Water Reactivity | Generally stable in water but avoid contamination; some formulations may hydrolyze slowly |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3105
Extinguishing Media
Dry chemical, CO2, water spray for cooling only; avoid standard foam on burning material
PPE Requirements
⚠️ Level B minimum for spills; full face SCBA required; chemical resistant suit; keep containers cool with water spray from distance
Isolation & Evacuation
ERG 145: Isolate spill 50m all directions; if fire or large spill isolate 800m initially, protect downwind 1600m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 145).
First Actions for a UN 3105 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 3105 — Organic peroxide type D, liquidHAZMAT RADIO NOTE — UN 3105
Product: Organic peroxide type D, liquid
Class 5 / Organic Peroxide / ERG 145
PPE: Level B minimum for spills; full face SCBA required; chemical resistant suit; keep containers cool with water spray from distance
ISOLATION: ERG 145: Isolate spill 50m all directions; if fire or large spill isolate 800m initially, protect downwind 1600m
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 3105 — Organic peroxide type D, liquid
Class: 5 | Placard: Organic Peroxide | ERG Guide: 145
Appearance: Clear to colored liquid depending on formulation. Odor varies by specific peroxide compound. May be viscous or thin liquid at room temperature.
Water Reactivity: Generally stable in water but avoid contamination; some formulations may hydrolyze slowly
Extinguishing: Dry chemical, CO2, water spray for cooling only; avoid standard foam on burning material
PPE: Level B minimum for spills; full face SCBA required; chemical resistant suit; keep containers cool with water spray from distance
Isolation: ERG 145: Isolate spill 50m all directions; if fire or large spill isolate 800m initially, protect downwind 1600m
— 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/3105 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3105 Organic peroxide type D, liquid Cls5 ERG145 | allfirefighter.com/hazmat/un/3105SMS / 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/3105
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Frequently Asked Questions about UN 3105
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 for spills; full face SCBA required; chemical resistant suit; keep containers cool with water spray from distance
Water reactivity: Generally stable in water but avoid contamination; some formulations may hydrolyze slowly. Recommended extinguishing: Dry chemical, CO2, water spray for cooling only; avoid standard foam on burning material.
ERG Guide 145 recommendation: ERG 145: Isolate spill 50m all directions; if fire or large spill isolate 800m initially, protect downwind 1600m
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.