UN 3174 — Titanium disulphide
Placard: Spontaneously Combustible. ERG Guide 135. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3174 At a Glance
UN 3174 (Titanium disulphide) is listed as DOT Class 4 Spontaneously Combustible 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.
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.