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 At a Glance
UN 3100 (Oxidizing solid, self-heating) is listed as DOT Class 5 Oxidizer and is assigned to ERG Guide 135. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
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.