☣️ UN 3174 • CLASS 4
UN 3174 — Titanium disulphide
Placard: Spontaneously Combustible. ERG Guide 135. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 3174 Quick Details
UN 3174
Product name: Titanium disulphide
DOT Class: 4
Placard type: Spontaneously Combustible
ERG Guide: 135 (check current ERG)
Initial isolation: ERG 135: isolate 25m minimum initially; for large spills isolate 50m all directions; if fire or material involved in fire, isolate 800m all directions and consider evacuation
Common Hazards of UN 3174
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| 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 to release heat and potentially ignite; avoid water contact |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3174
Extinguishing Media
Dry sand, dry chemical, soda ash; DO NOT use water or foam
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit for fire exposure; avoid moisture contact
Isolation & Evacuation
ERG 135: isolate 25m minimum initially; for large spills isolate 50m all directions; if fire or material involved in fire, isolate 800m all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 135).
First Actions for a UN 3174 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 3174 — Titanium disulphideHAZMAT RADIO NOTE — UN 3174
Product: Titanium disulphide
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum; SCBA required; chemical-resistant suit for fire exposure; avoid moisture contact
ISOLATION: ERG 135: isolate 25m minimum initially; for large spills isolate 50m all directions; if fire or material involved in fire, isolate 800m all directions and consider evacuation
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 3174 — Titanium disulphide
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Black to dark gray crystalline powder or solid. Odorless. Solid at room temperature with a layered crystal structure.
Water Reactivity: Reacts with moisture or moist air to release heat and potentially ignite; avoid water contact
Extinguishing: Dry sand, dry chemical, soda ash; DO NOT use water or foam
PPE: Level B minimum; SCBA required; chemical-resistant suit for fire exposure; avoid moisture contact
Isolation: ERG 135: isolate 25m minimum initially; for large spills isolate 50m all directions; if fire or material involved in fire, isolate 800m all directions and consider evacuation
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/3174 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3174 Titanium disulphide Cls4 ERG135 | ERG 135: isolate 25m minimum initially; for large spills isolate 50m all directi | allfirefighter.com/hazmat/un/3174SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/3174
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Frequently Asked Questions about UN 3174
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level B minimum; SCBA required; chemical-resistant suit for fire exposure; avoid moisture contact
Water reactivity: Reacts with moisture or moist air to release heat and potentially ignite; avoid water contact. Recommended extinguishing: Dry sand, dry chemical, soda ash; DO NOT use water or foam.
ERG Guide 135 recommendation: ERG 135: isolate 25m minimum initially; for large spills isolate 50m all directions; if fire or material involved in fire, isolate 800m all directions and consider evacuation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.