UN 2441 — Titanium trichloride mixture, pyrophoric
Placard: Spontaneously Combustible. ERG Guide 135. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2441 is Titanium trichloride mixture, pyrophoric, a pyrophoric moisture-reactive mixture assigned to ERG Guide 135. It may ignite on moist air and release HCl fumes.
Hazard overview: PYROPHORIC and moisture-reactive titanium trichloride mixture; may ignite on contact with moist air. Reacts with water, releasing heat, hydrogen chloride fumes and possibly hydrogen gas. May burn rapidly and re-ignite after apparent extinguishment.
Response guidance: For UN 2441, isolate the spill, stay upwind and use SCBA with chemical protection. Control moisture contact, contain acidic runoff and use dry compatible agents under SDS and ERG 135 guidance.
Firefighter training notes: Training for UN 2441 should emphasize pyrophoric ignition, moisture exclusion, no-water/no-foam tactics, dry media, re-ignition checks and corrosive fume control. Use ERG 135, SDS and local SOP.
Regulatory context: Titanium trichloride mixture, pyrophoric is regulated as a hazardous material for transport and emergency response. Storage, exposure, spill reporting, waste and fire-code duties depend on quantity, concentration and jurisdiction; verify shipping papers, SDS and local authority requirements.
Storage & handling: Titanium trichloride mixture, pyrophoric should be stored dry in tightly closed compatible containers away from water, moisture, bases, oxidizers/reducing agents where incompatible, heat and unauthorized access. Provide secondary containment.
UN 2441 Quick Details
Common Hazards of UN 2441
- PYROPHORIC and moisture-reactive titanium trichloride mixture; may ignite on contact with moist air.
- Reacts with water, releasing heat, hydrogen chloride fumes and possibly hydrogen gas.
- May burn rapidly and re-ignite after apparent extinguishment.
- Water, foam or CO2 may worsen the reaction or spread corrosive contamination.
- Fire may produce titanium oxides, hydrogen chloride and irritating/toxic smoke.
- Runoff may create fire, explosion and corrosive hazards.
- Exact mixture composition must be verified before close approach.
Chemical Identity & Physical Properties
Dark violet to purple-black crystalline solid or powder. Odorless when pure. Highly reactive with moisture.
| Also known as | Titanium(III) chlorideTrichlorotitaniumTitanous chlorideTiCl3 |
| CAS Number | 7705-07-9 |
| Appearance | Dark violet to purple-black crystalline solid or powder. Odorless when pure. Highly reactive with moisture. |
| Flash Point | Not applicable (pyrophoric solid) |
| Boiling Point | Not applicable (decomposes) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts violently with water producing heat, hydrogen chloride fumes, and hydrogen gas. Do not use water. |
Fireground Response Guidance — UN 2441
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing. Level A may be needed for heavy vapor, fuming, splash risk or unknown concentrations.
Isolation & Evacuation
First Actions for a UN 2441 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 water contact controlled because moisture can increase heat release, corrosive fuming or ignition.
- Do not touch damaged containers or spilled material without proper training and PPE.
- 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 2441 — Titanium trichloride mixture, pyrophoricUse 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.