☣️ UN 0377 • CLASS 1
UN 0377 — Primers, cap type
Placard: Explosive 1.1B. ERG Guide 112. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
UN 0377 Quick Details
UN 0377
Product name: Primers, cap type
DOT Class: 1
Placard type: Explosive 1.1B
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: Isolate 500 meters in all directions; evacuate 1600 meters downwind if material on fire or involved in fire; mass explosion hazard requires maximum evacuation radius
Common Hazards of UN 0377
- 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 | Percussion capsBlasting capsInitiator capsDetonator primersCap-type primers |
| Appearance | Small metallic cylindrical devices containing primary explosives, typically brass or aluminum construction with sensitive explosive composition inside. |
| Flash Point | Not applicable (explosive article) |
| Boiling Point | Not applicable (explosive article) |
| Vapor Density | Not applicable (solid explosive device) |
| Water Reactivity | No significant reaction with water, but moisture may degrade explosive sensitivity over time |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0377
Extinguishing Media
Do not use water or foam on burning explosives; evacuate area and allow to burn; dry sand or earth for small isolated fires only
PPE Requirements
⚠️ Level A with full face SCBA required for fire response; approach from protected position; maximum standoff distance; no entry to explosive fire area
Isolation & Evacuation
ERG 112: Isolate 500 meters in all directions; evacuate 1600 meters downwind if material on fire or involved in fire; mass explosion hazard requires maximum evacuation radius
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0377 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.
Advertisement
📋 Copy & Share Field Card
UN 0377 — Primers, cap typeHAZMAT RADIO NOTE — UN 0377
Product: Primers, cap type
Class 1 / Explosive 1.1B / ERG 112
PPE: Level A with full face SCBA required for fire response; approach from protected position; maximum standoff distance; no entry to explosive fire area
ISOLATION: ERG 112: Isolate 500 meters in all directions; evacuate 1600 meters downwind if material on fire or involved in fire; mass explosion hazard requires maximum evacuation radius
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 0377 — Primers, cap type
Class: 1 | Placard: Explosive 1.1B | ERG Guide: 112
Appearance: Small metallic cylindrical devices containing primary explosives, typically brass or aluminum construction with sensitive explosive composition inside.
Water Reactivity: No significant reaction with water, but moisture may degrade explosive sensitivity over time
Extinguishing: Do not use water or foam on burning explosives; evacuate area and allow to burn; dry sand or earth for small isolated fires only
PPE: Level A with full face SCBA required for fire response; approach from protected position; maximum standoff distance; no entry to explosive fire area
Isolation: ERG 112: Isolate 500 meters in all directions; evacuate 1600 meters downwind if material on fire or involved in fire; mass explosion hazard requires maximum evacuation radius
— 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/0377 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0377 Primers, cap type Cls1 ERG112 | ERG 112: Isolate 500 meters in all directions; evacuate 1600 meters downwind if | allfirefighter.com/hazmat/un/0377SMS / 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/0377
Related UN Numbers in Class 1
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
Advertisement
Frequently Asked Questions about UN 0377
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 with full face SCBA required for fire response; approach from protected position; maximum standoff distance; no entry to explosive fire area
Water reactivity: No significant reaction with water, but moisture may degrade explosive sensitivity over time. Recommended extinguishing: Do not use water or foam on burning explosives; evacuate area and allow to burn; dry sand or earth for small isolated fires only.
ERG Guide 112 recommendation: ERG 112: Isolate 500 meters in all directions; evacuate 1600 meters downwind if material on fire or involved in fire; mass explosion hazard requires maximum evacuation radius
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.