UN 3100 — Oxidizing solid, self-heating, n.o.s.
Placard: Oxidizer. ERG Guide 135. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3100 is Oxidizing solid, self-heating, n.o.s., a broad oxidizing self-heating solid assigned to ERG Guide 135. Heat buildup and incompatible materials drive risk.
Hazard overview: OXIDIZING self-heating solid, n.o.s.; may heat and ignite without an external flame. Can accelerate burning and may decompose violently if heated or contaminated. Moisture, air exposure, pile size or damaged packaging may increase self-heating.
Response guidance: For UN 3100, isolate the area, remove combustibles/reducing agents and identify the exact oxidizer. Use compatible tactics and contain toxic/corrosive runoff under ERG 135.
Firefighter training notes: Training for UN 3100 should emphasize product verification, SCBA use, oxidizer/corrosive compatibility, vapor/dust monitoring, decontamination and runoff control. Use ERG 135, SDS and local SOP.
Regulatory context: Oxidizing solid, self-heating, n.o.s. 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: Oxidizing solid, self-heating, n.o.s. should be stored in compatible oxidizer/corrosive-rated containers away from combustibles, organics, fuels, reducing agents, heat and contamination.
UN 3100 Quick Details
Common Hazards of UN 3100
- OXIDIZING self-heating solid, n.o.s.; may heat and ignite without an external flame.
- Can accelerate burning and may decompose violently if heated or contaminated.
- Moisture, air exposure, pile size or damaged packaging may increase self-heating.
- Contact with combustibles, organics or reducing agents may cause fire or explosion.
- May re-ignite after apparent extinguishment.
- Fire may produce toxic/corrosive oxidizer smoke.
- Exact product and package condition must be verified from SDS.
Chemical Identity & Physical Properties
Variable appearance depending on specific substance; typically a solid material that may be in powder, granular, or crystalline form. Color and odor vary by composition. Capable of spontaneous heating when exposed to air or moisture.
| Also known as | Oxidizing solid self-heating NOSSelf-heating oxidizerClass 5.1 self-heating solid |
| Appearance | Variable appearance depending on specific substance; typically a solid material that may be in powder, granular, or crystalline form. Color and odor vary by composition. Capable of spontaneous heating when exposed to air or moisture. |
| Flash Point | Not applicable (oxidizing solid, self-heating material) |
| Boiling Point | Not applicable (decomposes or ignites before boiling) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | May ignite on contact with moisture; avoid water contact unless specified for the particular substance |
Fireground Response Guidance — UN 3100
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for fire, dust or decomposition fumes. Wear chemical/thermal protection and keep distance for explosion or rapid-burning risk.
Isolation & Evacuation
First Actions for a UN 3100 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.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Keep combustibles, organics, fuels and reducing agents away from the oxidizer.
- 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 135, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3100 — Oxidizing solid, self-heating, 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.