☣️ UN 0155 • CLASS 1
UN 0155 — Trinitrochlorobenzene; Picryl chloride
Placard: Explosive 1.1D. ERG Guide 112. 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 0155 Quick Details
UN 0155
Product name: Trinitrochlorobenzene; Picryl chloride
DOT Class: 1
Placard type: Explosive 1.1D
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: Isolate 500m (1600 ft) in all directions; evacuate 1600m (1 mile) in all directions if fire or detonation risk
Common Hazards of UN 0155
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
Chemical Identity & Physical Properties
| Also known as | Picryl chloride2,4,6-TrinitrochlorobenzeneTNCB1-Chloro-2,4,6-trinitrobenzene |
| CAS Number | 88-88-0 |
| Appearance | Yellow crystalline solid with no distinct odor. Sensitive explosive compound that is stable when dry but highly hazardous when handled. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Decomposes before boiling; not applicable |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water, but water is used to desensitize during transport |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0155
Extinguishing Media
Do not use foam, water spray, or CO2 on fires; dry sand or earth only if small; evacuate area for large fires
PPE Requirements
⚠️ Level B minimum with full structural firefighting gear; SCBA mandatory; maintain maximum distance from explosive materials
Isolation & Evacuation
ERG 112: Isolate 500m (1600 ft) in all directions; evacuate 1600m (1 mile) in all directions if fire or detonation risk
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0155 Incident
- CALL 911. Then call emergency response telephone number on shipping paper.
- Establish large isolation zone — minimum 500 meters in all directions.
- Stage upwind, uphill; limit personnel to essential responders only.
- Request Hazmat + law enforcement + additional resources immediately.
- Do not fight fire — evacuate and isolate; let burn if no life safety risk.
- Protect exposures only if safe and directed by command.
- Consult current ERG Guide 112 and follow SOP/SOG.
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📋 Copy & Share Field Card
UN 0155 — Trinitrochlorobenzene; Picryl chlorideHAZMAT RADIO NOTE — UN 0155
Product: Trinitrochlorobenzene; Picryl chloride
Class 1 / Explosive 1.1D / ERG 112
PPE: Level B minimum with full structural firefighting gear; SCBA mandatory; maintain maximum distance from explosive materials
ISOLATION: ERG 112: Isolate 500m (1600 ft) in all directions; evacuate 1600m (1 mile) in all directions if fire or detonation risk
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 0155 — Trinitrochlorobenzene; Picryl chloride
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: Yellow crystalline solid with no distinct odor. Sensitive explosive compound that is stable when dry but highly hazardous when handled.
Water Reactivity: No significant reaction with water, but water is used to desensitize during transport
Extinguishing: Do not use foam, water spray, or CO2 on fires; dry sand or earth only if small; evacuate area for large fires
PPE: Level B minimum with full structural firefighting gear; SCBA mandatory; maintain maximum distance from explosive materials
Isolation: ERG 112: Isolate 500m (1600 ft) in all directions; evacuate 1600m (1 mile) in all directions if fire or detonation risk
— Key Hazards —
• Mass explosion hazard — entire load may detonate simultaneously.
• Severe blast overpressure and fragmentation.
• Sensitive to heat, shock, and friction.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Establish large isolation zone — minimum 500 meters in all directions.
• Stage upwind, uphill; limit personnel to essential responders only.
• Request Hazmat + law enforcement + additional resources immediately.
SOURCE: allfirefighter.com/hazmat/un/0155 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0155 Trinitrochlorobenzene; Picryl chloride Cls1 ERG112 | allfirefighter.com/hazmat/un/0155SMS / 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/0155
Related UN Numbers in Class 1
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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Frequently Asked Questions about UN 0155
Mass explosion hazard — entire load may detonate simultaneously. Severe blast overpressure and fragmentation. Sensitive to heat, shock, and friction. Secondary fire and debris hazard.
CALL 911. Then call emergency response telephone number on shipping paper. Establish large isolation zone — minimum 500 meters in all directions. Stage upwind, uphill; limit personnel to essential responders only.
Level B minimum with full structural firefighting gear; SCBA mandatory; maintain maximum distance from explosive materials
Water reactivity: No significant reaction with water, but water is used to desensitize during transport. Recommended extinguishing: Do not use foam, water spray, or CO2 on fires; dry sand or earth only if small; evacuate area for large fires.
ERG Guide 112 recommendation: ERG 112: Isolate 500m (1600 ft) in all directions; evacuate 1600m (1 mile) in all directions if fire or detonation risk
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 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.