UN 1350 — Sulphur
Placard: Miscellaneous. ERG Guide 133. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1350 is Sulphur, a Class 4 flammable solid assigned to ERG Guide 133. It may burn as powder, granules, lumps or softened material depending on the exact product and fire conditions.
Hazard overview: UN 1350 presents flammable solid, dust and smoke hazards. Powders can burn rapidly or form dust-air mixtures, while fire may produce irritating smoke and contaminated residue.
Response guidance: For a UN 1350 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 133. Establish incident command, isolate the area, stay upwind, avoid unnecessary disturbance of powder or damaged packaging, and use only extinguishing agents compatible with the specific material.
Firefighter training notes: Training for UN 1350 should emphasize dust fire behavior, rapid surface burning, smoke exposure, compatible extinguishment and avoiding dust cloud generation. Use ERG 133, SDS and local SOP.
Regulatory context: Sulphur is regulated as a hazardous material for transportation and emergency response purposes. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by formulation, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Sulphur should be stored in compatible containers in a cool, dry, well-ventilated area away from heat, sparks, open flames, oxidizers and incompatible materials. Prevent dust release, friction, impact and unauthorized access.
UN 1350 Quick Details
Common Hazards of UN 1350
- FLAMMABLE material; may be ignited by heat, sparks or flames.
- Fire may produce irritating or toxic smoke.
- Containers may rupture or fail when heated.
- Specific hazards depend on the exact product and should be verified from SDS.
Chemical Identity & Physical Properties
Yellow crystalline solid or powder with no odor at room temperature. May appear as lumps, powder, or molten liquid when heated.
| Also known as | SulfurBrimstoneSulphur flowersColloidal sulfurElemental sulfur |
| CAS Number | 7704-34-9 |
| Appearance | Yellow crystalline solid or powder with no odor at room temperature. May appear as lumps, powder, or molten liquid when heated. |
| Flash Point | Not applicable (solid, ignition temperature ~190C/374F) |
| Boiling Point | 444.6C (832.3F) |
| Vapor Density | Not applicable (solid at room temperature) |
| Water Reactivity | No significant reaction with water. Insoluble in water. |
Fireground Response Guidance — UN 1350
Extinguishing Media
PPE Requirements
Use SCBA for fire, smoke, dust or confined-space exposure. Gloves, eye protection and protective clothing should be selected from SDS; avoid dust generation and contaminated residue contact.
Isolation & Evacuation
First Actions for a UN 1350 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Eliminate ignition sources if it is safe to do so.
- Avoid creating dust clouds or spreading powder during movement or cleanup.
- Ventilate closed spaces before entering, but only if properly trained, equipped and authorized by incident command.
- Isolate the spill or fire area and expand the perimeter if large quantities, dust clouds or fire involvement are present.
- Use ERG Guide 133, shipping papers, SDS and incident command for protective actions and entry decisions.
📋 Copy & Share Field Card
UN 1350 — SulphurUse 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.