UN 3174 — Titanium disulphide
Placard: Spontaneously Combustible. ERG Guide 135. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Titanium disulphide is a reactive dark solid. Finely divided material can present moisture-sensitive fire behavior.
Hazard overview: The main risks are spontaneous heating, moisture-triggered ignition, toxic smoke and re-ignition after fire control.
Response guidance: Keep the material dry, isolate the area and use dry extinguishing agents. Avoid water streams, foam and wet cleanup unless SDS confirms compatibility.
Firefighter training notes: Use this page as initial reference only; responders should train from ERG, SDS, department SOPs and product-specific preplans.
Regulatory context: UN 3174 is regulated for transport under its proper shipping name, hazard class 4 and ERG Guide 135. Verify current DOT/PHMSA requirements and shipping papers.
Storage & handling: Store only as permitted by the SDS and applicable code: segregate from incompatible materials, protect packages from heat, damage and moisture, and maintain labels.
UN 3174 Quick Details
Common Hazards of UN 3174
- Spontaneously combustible solid; fine material may ignite when exposed to moisture or humid air.
- Water or foam contact can intensify the reaction and create heat or flammable gases.
- Burning material may produce irritating sulfur and titanium oxide fumes.
- Dust can be irritating and may create localized fire risk when dispersed.
- Containers may fail when heated.
- Re-ignition is possible after apparent extinguishment.
- Runoff or wet cleanup can spread reactive material.
Chemical Identity & Physical Properties
Black to dark gray crystalline powder or solid. Odorless. Solid at room temperature with a layered crystal structure.
| Also known as | Titanium sulfideTitanium(IV) disulfideTitanium bisulfideTiS2 |
| CAS Number | 12039-13-3 |
| Appearance | Black to dark gray crystalline powder or solid. Odorless. Solid at room temperature with a layered crystal structure. |
| Flash Point | Not applicable (pyrophoric/water-reactive solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with moisture or moist air, generating heat and possible ignition; keep dry |
Fireground Response Guidance — UN 3174
Extinguishing Media
PPE Requirements
Use SCBA, chemical-resistant clothing and eye protection; upgrade protection for dust, smoke or unknown contamination.
Isolation & Evacuation
First Actions for a UN 3174 Incident
- Call 911 and the emergency response number shown on shipping papers.
- Keep unauthorized personnel away and establish an isolation perimeter.
- Stay upwind, uphill and upstream; avoid low areas where vapors or gases may collect.
- Avoid breathing vapors, dust, smoke or decomposition products.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Keep material dry; do not apply water or foam directly to the spill or burning solid.
- Ventilate confined spaces only if trained, equipped and atmospheric monitoring supports entry.
- Use ERG guidance, SDS, labels and shipping papers to confirm the exact hazards before action.
📋 Copy & Share Field Card
UN 3174 — Titanium disulphideUse 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.