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.
UN 3102 At a Glance
UN 3102 (Organic peroxide type B, solid) is listed as DOT Class 5 Organic Peroxide and is assigned to ERG Guide 146. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
UN 3102 is Organic peroxide type B, solid, an organic peroxide entry assigned to ERG Guide 146. Heat, shock, friction and contamination can cause violent decomposition.
Hazard overview: More hazardous type B organic peroxide solid; heat, contamination, friction or shock may cause violent decomposition or explosion. May burn rapidly with a flare effect and may ignite nearby combustibles. Containers may rupture or explode when heated or if decomposition starts.
Response guidance: For UN 3102, isolate widely, keep heat/shock/friction/contamination away and cool exposed containers from protection if safe. Follow SDS temperature limits and ERG 146.
Firefighter training notes: Training for UN 3102 should emphasize organic peroxide instability, SADT/control temperature, contamination avoidance, remote cooling, evacuation triggers and runoff control. Use ERG 146, SDS and local SOP.
Regulatory context: Organic peroxide type B, solid is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, formulation, temperature-control status and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Organic peroxide type B, solid should be stored in approved peroxide-compatible containers away from heat, sunlight, friction, contamination, acids, bases, metals, reducing agents and combustibles.
UN 3102 Quick Details
Common Hazards of UN 3102
- More hazardous type B organic peroxide solid; heat, contamination, friction or shock may cause violent decomposition or explosion.
- May burn rapidly with a flare effect and may ignite nearby combustibles.
- Containers may rupture or explode when heated or if decomposition starts.
- Contamination with acids, bases, metals, reducing agents or organic material can increase instability.
- Fire may produce irritating, corrosive and toxic gases.
- Runoff may carry reactive peroxide contamination.
- Exact formulation, dilution, control temperature and emergency temperature must be verified from SDS and shipping papers.
Chemical Identity & Physical Properties
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.
| 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 |
Fireground Response Guidance — UN 3102
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA, chemical-resistant protective clothing and distance/blast protection. Avoid contaminated PPE, friction, heat and direct contact.
Isolation & Evacuation
First Actions for a UN 3102 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Eliminate ignition sources and keep heat, friction, shock and contamination away from the material.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 146, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3102 — Organic peroxide type B, solidUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.