☣️ UN 0257 • CLASS 1
UN 0257 — Fuzes, detonating
Placard: Explosive 1.4B. ERG Guide 114. 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 0257 Quick Details
UN 0257
Product name: Fuzes, detonating
DOT Class: 1
Placard type: Explosive 1.4B
ERG Guide: 114 (check current ERG)
Initial isolation: ERG 114: isolate 200m all directions; if fire involves large quantities, increase isolation to 500m and consider evacuation of 800m radius
Common Hazards of UN 0257
- Minor blast or fire hazard — limited effect.
- Localized burning or deflagration possible.
- Smoke and heat from burning.
- Low mass explosion risk under normal conditions.
Chemical Identity & Physical Properties
| Also known as | Detonating fuzesDetonator fuzesBlasting fuzesExplosive fuzes |
| Appearance | Metallic or plastic cylindrical devices containing small explosive charges. Typically solid assemblies in various colors depending on manufacturer and military/commercial specifications. |
| Flash Point | Not applicable (explosive article) |
| Boiling Point | Not applicable (explosive article) |
| Vapor Density | Not applicable (solid article) |
| Water Reactivity | No significant reaction with water, though moisture may degrade some fuze components over time |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0257
Extinguishing Media
Water spray, foam acceptable for fire control from distance; do not approach burning articles
PPE Requirements
⚠️ Full protective clothing and SCBA required. Approach cautiously from upwind/protected location. Evacuate personnel from immediate area.
Isolation & Evacuation
ERG 114: isolate 200m all directions; if fire involves large quantities, increase isolation to 500m and consider evacuation of 800m radius
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 114).
First Actions for a UN 0257 Incident
- CALL 911. Notify law enforcement.
- Isolate area; keep unauthorized personnel away.
- Stage upwind; eliminate ignition sources.
- Request Hazmat + law enforcement.
- Consult current ERG Guide 114 and follow SOP/SOG.
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📋 Copy & Share Field Card
UN 0257 — Fuzes, detonatingHAZMAT RADIO NOTE — UN 0257
Product: Fuzes, detonating
Class 1 / Explosive 1.4B / ERG 114
PPE: Full protective clothing and SCBA required. Approach cautiously from upwind/protected location. Evacuate personnel from immediate area.
ISOLATION: ERG 114: isolate 200m all directions; if fire involves large quantities, increase isolation to 500m and consider evacuation of 800m 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 0257 — Fuzes, detonating
Class: 1 | Placard: Explosive 1.4B | ERG Guide: 114
Appearance: Metallic or plastic cylindrical devices containing small explosive charges. Typically solid assemblies in various colors depending on manufacturer and military/commercial specifications.
Water Reactivity: No significant reaction with water, though moisture may degrade some fuze components over time
Extinguishing: Water spray, foam acceptable for fire control from distance; do not approach burning articles
PPE: Full protective clothing and SCBA required. Approach cautiously from upwind/protected location. Evacuate personnel from immediate area.
Isolation: ERG 114: isolate 200m all directions; if fire involves large quantities, increase isolation to 500m and consider evacuation of 800m radius
— Key Hazards —
• Minor blast or fire hazard — limited effect.
• Localized burning or deflagration possible.
• Smoke and heat from burning.
— First Actions —
• CALL 911. Notify law enforcement.
• Isolate area; keep unauthorized personnel away.
• Stage upwind; eliminate ignition sources.
• Request Hazmat + law enforcement.
SOURCE: allfirefighter.com/hazmat/un/0257 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0257 Fuzes, detonating Cls1 ERG114 | ERG 114: isolate 200m all directions; if fire involves large quantities, increas | allfirefighter.com/hazmat/un/0257SMS / 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/0257
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 0257
Minor blast or fire hazard — limited effect. Localized burning or deflagration possible. Smoke and heat from burning. Low mass explosion risk under normal conditions.
CALL 911. Notify law enforcement. Isolate area; keep unauthorized personnel away. Stage upwind; eliminate ignition sources.
Full protective clothing and SCBA required. Approach cautiously from upwind/protected location. Evacuate personnel from immediate area.
Water reactivity: No significant reaction with water, though moisture may degrade some fuze components over time. Recommended extinguishing: Water spray, foam acceptable for fire control from distance; do not approach burning articles.
ERG Guide 114 recommendation: ERG 114: isolate 200m all directions; if fire involves large quantities, increase isolation to 500m and consider evacuation of 800m radius
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 114 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.