UN 3535 — Toxic solid, flammable, inorganic, n.o.s.
Placard: Toxic. ERG Guide 134. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3535 is Toxic solid, flammable, inorganic, n.o.s., a broad toxic flammable inorganic solid assigned to ERG Guide 134. Exact composition controls water compatibility and fumes.
Hazard overview: TOXIC and FLAMMABLE inorganic solid, n.o.s.; inhalation, ingestion or skin contact may cause severe injury. May ignite from heat, sparks, friction or contamination depending on exact substance. Dust may spread toxic contamination and increase fire surface area.
Response guidance: For UN 3535, isolate the area, avoid exposure and use SCBA where vapor, gas, dust, smoke or fire is present. Verify exact controls with SDS/ERG 134.
Firefighter training notes: Training for UN 3535 should emphasize product/article verification, SCBA use, pressure-release hazards, decontamination, runoff containment and SDS/shipping paper review. Use ERG 134, SDS and local SOP.
Regulatory context: Toxic solid, flammable, inorganic, 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, package type, gas identity and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Toxic solid, flammable, inorganic, n.o.s. should be stored in compatible packages with ventilation, restricted access and segregation based on SDS and shipping paper requirements.
UN 3535 Quick Details
Common Hazards of UN 3535
- TOXIC and FLAMMABLE inorganic solid, n.o.s.; inhalation, ingestion or skin contact may cause severe injury.
- May ignite from heat, sparks, friction or contamination depending on exact substance.
- Dust may spread toxic contamination and increase fire surface area.
- Some inorganic solids may react with water, acids or oxidizers; verify SDS before applying water.
- Fire may produce toxic metal, acid or inorganic fumes.
- Runoff may be toxic and environmentally harmful.
- Exact inorganic solid and particle size must be verified from shipping papers and SDS.
Chemical Identity & Physical Properties
Variable appearance depending on specific substance; typically a solid material at room temperature that is both toxic and flammable. May range from crystalline powders to granular solids with varying colors and odors.
| Also known as | Toxic solid, flammable, inorganic, n.o.s.Poisonous solid, flammable, inorganic, not otherwise specifiedFlammable toxic inorganic solid |
| Appearance | Variable appearance depending on specific substance; typically a solid material at room temperature that is both toxic and flammable. May range from crystalline powders to granular solids with varying colors and odors. |
| Flash Point | Variable - flammable solid, ignition temperature depends on specific material |
| Boiling Point | Variable - depends on specific inorganic compound |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Variable - may range from no reaction to violent reaction depending on specific substance |
Fireground Response Guidance — UN 3535
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for dust, smoke or fire. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 3535 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, gas, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers, equipment, articles 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 134, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3535 — Toxic solid, flammable, inorganic, n.o.sUse 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.