☣️ UN 0121 • CLASS 1
UN 0121 — Igniters
Placard: Explosive 1.1G. 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 0121 Quick Details
UN 0121
Product name: Igniters
DOT Class: 1
Placard type: Explosive 1.1G
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: isolate 500m in all directions; evacuate 1600m downwind if fire involved; treat as mass explosion hazard
Common Hazards of UN 0121
- Initiation hazard — can trigger other explosives
- Fire and fragmentation on activation
- Sensitive to electrical charge and heat
Chemical Identity & Physical Properties
| Also known as | Electric ignitersIgniter assembliesPyrotechnic ignitersSquibsIgnition devices |
| Appearance | Small metallic or composite devices containing explosive or pyrotechnic material, typically enclosed in metal or plastic housings. Designed to produce flame, heat, or shock to initiate other explosive charges. |
| Flash Point | Not applicable (explosive device) |
| Boiling Point | Not applicable (explosive device) |
| Vapor Density | Not applicable (solid device) |
| Water Reactivity | No significant reaction with water, but water may not extinguish burning igniters |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0121
Extinguishing Media
Do not fight fire when fire reaches explosives; evacuate area and let burn
PPE Requirements
⚠️ Level B minimum with SCBA required; full protective clothing; approach with extreme caution; avoid static discharge
Isolation & Evacuation
ERG 112: isolate 500m in all directions; evacuate 1600m downwind if fire involved; treat as mass explosion hazard
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0121 Incident
- CALL 911. Then call emergency response number on shipping paper.
- Isolate minimum 500 meters
- Stage upwind; deny entry
- Request Hazmat + law enforcement
- Consult current ERG Guide 112 and SOP/SOG
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📋 Copy & Share Field Card
UN 0121 — IgnitersHAZMAT RADIO NOTE — UN 0121
Product: Igniters
Class 1 / Explosive 1.1G / ERG 112
PPE: Level B minimum with SCBA required; full protective clothing; approach with extreme caution; avoid static discharge
ISOLATION: ERG 112: isolate 500m in all directions; evacuate 1600m downwind if fire involved; treat as mass explosion hazard
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 0121 — Igniters
Class: 1 | Placard: Explosive 1.1G | ERG Guide: 112
Appearance: Small metallic or composite devices containing explosive or pyrotechnic material, typically enclosed in metal or plastic housings. Designed to produce flame, heat, or shock to initiate other explosive charges.
Water Reactivity: No significant reaction with water, but water may not extinguish burning igniters
Extinguishing: Do not fight fire when fire reaches explosives; evacuate area and let burn
PPE: Level B minimum with SCBA required; full protective clothing; approach with extreme caution; avoid static discharge
Isolation: ERG 112: isolate 500m in all directions; evacuate 1600m downwind if fire involved; treat as mass explosion hazard
— Key Hazards —
• Initiation hazard — can trigger other explosives
• Fire and fragmentation on activation
• Sensitive to electrical charge and heat
— First Actions —
• CALL 911. Then call emergency response number on shipping paper.
• Isolate minimum 500 meters
• Stage upwind; deny entry
• Request Hazmat + law enforcement
SOURCE: allfirefighter.com/hazmat/un/0121 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0121 Igniters Cls1 ERG112 | ERG 112: isolate 500m in all directions; evacuate 1600m downwind if fire involve | allfirefighter.com/hazmat/un/0121SMS / 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/0121
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 0121
Initiation hazard — can trigger other explosives Fire and fragmentation on activation Sensitive to electrical charge and heat
CALL 911. Then call emergency response number on shipping paper. Isolate minimum 500 meters Stage upwind; deny entry
Level B minimum with SCBA required; full protective clothing; approach with extreme caution; avoid static discharge
Water reactivity: No significant reaction with water, but water may not extinguish burning igniters. Recommended extinguishing: Do not fight fire when fire reaches explosives; evacuate area and let burn.
ERG Guide 112 recommendation: ERG 112: isolate 500m in all directions; evacuate 1600m downwind if fire involved; treat as mass explosion hazard
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.