☣️ UN 3102 • CLASS 5
UN 3102 — Organic peroxide type B, solid
Placard: Organic Peroxide. ERG Guide 146. 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 3102 Quick Details
UN 3102
Product name: Organic peroxide type B, solid
DOT Class: 5
Placard type: Organic Peroxide
ERG Guide: 146 (check current ERG)
Initial isolation: ERG 146: isolate spill 100m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider initial evacuation 800m
Common Hazards of UN 3102
- May explode from heat, shock, friction 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 solidPeroxide explosive solidSelf-reactive peroxide type BClass 5.2 organic peroxide |
| Appearance | Solid material, typically white to off-white powder or crystalline substance. Color and odor vary depending on specific peroxide compound. Highly unstable and shock-sensitive. |
| Flash Point | Not applicable (self-reactive explosive solid) |
| Boiling Point | Not applicable (decomposes explosively before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react with water; avoid adding water directly to spills |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3102
Extinguishing Media
Dry chemical or CO2 for small fires; flood with water from distance for large fires
PPE Requirements
⚠️ Level A required for spill response; full structural firefighter protective clothing with SCBA for fire conditions; avoid all sources of ignition and shock
Isolation & Evacuation
ERG 146: isolate spill 100m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider initial evacuation 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 146).
First Actions for a UN 3102 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 3102 — Organic peroxide type B, solidHAZMAT RADIO NOTE — UN 3102
Product: Organic peroxide type B, solid
Class 5 / Organic Peroxide / ERG 146
PPE: Level A required for spill response; full structural firefighter protective clothing with SCBA for fire conditions; avoid all sources of ignition and shock
ISOLATION: ERG 146: isolate spill 100m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider initial evacuation 800m
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 3102 — Organic peroxide type B, solid
Class: 5 | Placard: Organic Peroxide | ERG Guide: 146
Appearance: Solid material, typically white to off-white powder or crystalline substance. Color and odor vary depending on specific peroxide compound. Highly unstable and shock-sensitive.
Water Reactivity: May react with water; avoid adding water directly to spills
Extinguishing: Dry chemical or CO2 for small fires; flood with water from distance for large fires
PPE: Level A required for spill response; full structural firefighter protective clothing with SCBA for fire conditions; avoid all sources of ignition and shock
Isolation: ERG 146: isolate spill 100m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider initial evacuation 800m
— Key Hazards —
• May explode from heat, shock, friction 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/3102 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3102 Organic peroxide type B, solid Cls5 ERG146 | allfirefighter.com/hazmat/un/3102SMS / 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/3102
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Frequently Asked Questions about UN 3102
May explode from heat, shock, friction 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 A required for spill response; full structural firefighter protective clothing with SCBA for fire conditions; avoid all sources of ignition and shock
Water reactivity: May react with water; avoid adding water directly to spills. Recommended extinguishing: Dry chemical or CO2 for small fires; flood with water from distance for large fires.
ERG Guide 146 recommendation: ERG 146: isolate spill 100m all directions; if tank/railcar involved in fire, isolate 800m all directions and consider initial evacuation 800m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 146 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.