UN 3137 — Oxidizing solid, flammable, n.o.s.
Placard: Oxidizer. ERG Guide 140. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Oxidizing solid, flammable, n.o.s. is a broad entry for solids that combine oxidizer behavior with ignitable material. The exact formulation controls the response.
Hazard overview: This material is not simply a fuel; it can supply oxygen to a fire while also containing flammable components. Contamination with oils, paper, wood or reducing agents may increase fire or explosion risk.
Response guidance: Isolate the spill, keep combustibles away and avoid friction or unnecessary handling. Use the ERG, SDS and monitoring to choose extinguishing media; protect containers from heat from a safe distance.
Firefighter training notes: Train crews to separate oxidizers from fuels and to avoid sweeping, dragging or contaminating spilled material. Use remote isolation before product identity is confirmed.
Regulatory context: UN 3137 is a Class 5.1 oxidizer entry with flammable characteristics. Verify subsidiary risks, packing group and product details from shipping papers and SDS.
Storage & handling: Store dry, cool and away from fuels, oils, reducing agents, organic absorbents and ignition sources. Keep containers closed and protected from impact or heat.
UN 3137 Quick Details
Common Hazards of UN 3137
- Oxidizing solid that can intensify fire and support rapid burning of nearby combustibles.
- The flammable component may ignite from heat, sparks, friction or contamination.
- Mixtures with fuels, oils, organic material or reducing agents may become unstable.
- Some products may decompose violently when heated or involved in fire.
- Containers may rupture or explode when heated.
- Dust or spilled material can contaminate clothing, wood, paper or absorbents and create delayed ignition hazards.
- Exact behavior depends on the shipped composition; confirm SDS before applying water or foam.
Chemical Identity & Physical Properties
Physical appearance varies by composition and may include powders, granules or crystals. Treat unknown spilled material as heat- and contamination-sensitive.
| Also known as | Oxidizing solid, flammable, not otherwise specifiedClass 5.1 flammable oxidizerOxidizer/combustible mixture |
| Appearance | Variable appearance depending on specific composition; typically a solid material that combines oxidizing and flammable properties, may be powder, granular, or crystalline form. |
| Flash Point | Variable - depends on specific flammable component, typically low |
| Boiling Point | Not applicable (solid, may decompose before melting) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Variable - exercise caution, may react with water depending on composition |
Fireground Response Guidance — UN 3137
Extinguishing Media
PPE Requirements
Use SCBA and full protective clothing with chemical-resistant gloves. Avoid contaminated turnout gear contacting fuels or organic material after exposure.
Isolation & Evacuation
First Actions for a UN 3137 Incident
- Call 911 and the emergency response number shown on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command before close approach.
- Stay upwind, uphill and upstream; avoid low areas where vapors or gases may collect.
- Avoid breathing vapors, dust, mist or fire gases and avoid skin or eye contact.
- Do not touch damaged containers or spilled material without proper PPE and training.
- Ventilate confined spaces only if trained, equipped and authorized by incident command.
- Use ERG guidance, SDS, shipping papers and monitoring results for final protective actions.
📋 Copy & Share Field Card
UN 3137 — Oxidizing solid, flammable, n.o.s.Use 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.