☣️ UN 0129 • CLASS 1
UN 0129 — Lead azide, wetted
Placard: Explosive 1.1A. 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 0129 Quick Details
UN 0129
Product name: Lead azide, wetted
DOT Class: 1
Placard type: Explosive 1.1A
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: isolate 500m minimum all directions; evacuate 1600m downwind if fire or explosion risk
Common Hazards of UN 0129
- 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 | Lead diazideLead(II) azidePb(N3)2Plumbous azide |
| CAS Number | 13424-46-9 |
| Appearance | White to buff-colored crystalline powder or small crystals. Odorless. Supplied wetted with water or alcohol for safety during transport and handling. |
| Flash Point | Not applicable (primary explosive solid) |
| Boiling Point | Not applicable (decomposes explosively at approximately 350C) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Stable when wetted with at least 20% water; dry material is extremely shock-sensitive and explosive |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0129
Extinguishing Media
Water spray only to keep wetted; no foam, CO2, or dry chemical on dry material
PPE Requirements
⚠️ Level A required; full face SCBA mandatory; explosive-safe tools only; remote handling preferred
Isolation & Evacuation
ERG 112: isolate 500m minimum all directions; evacuate 1600m downwind if fire or explosion risk
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0129 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 0129 — Lead azide, wettedHAZMAT RADIO NOTE — UN 0129
Product: Lead azide, wetted
Class 1 / Explosive 1.1A / ERG 112
PPE: Level A required; full face SCBA mandatory; explosive-safe tools only; remote handling preferred
ISOLATION: ERG 112: isolate 500m minimum all directions; evacuate 1600m downwind if fire or explosion 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 0129 — Lead azide, wetted
Class: 1 | Placard: Explosive 1.1A | ERG Guide: 112
Appearance: White to buff-colored crystalline powder or small crystals. Odorless. Supplied wetted with water or alcohol for safety during transport and handling.
Water Reactivity: Stable when wetted with at least 20% water; dry material is extremely shock-sensitive and explosive
Extinguishing: Water spray only to keep wetted; no foam, CO2, or dry chemical on dry material
PPE: Level A required; full face SCBA mandatory; explosive-safe tools only; remote handling preferred
Isolation: ERG 112: isolate 500m minimum all directions; evacuate 1600m downwind if fire or explosion 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/0129 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0129 Lead azide, wetted Cls1 ERG112 | ERG 112: isolate 500m minimum all directions; evacuate 1600m downwind if fire or | allfirefighter.com/hazmat/un/0129SMS / 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/0129
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 0129
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 A required; full face SCBA mandatory; explosive-safe tools only; remote handling preferred
Water reactivity: Stable when wetted with at least 20% water; dry material is extremely shock-sensitive and explosive. Recommended extinguishing: Water spray only to keep wetted; no foam, CO2, or dry chemical on dry material.
ERG Guide 112 recommendation: ERG 112: isolate 500m minimum all directions; evacuate 1600m downwind if fire or explosion 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.