☣️ UN 0494 • CLASS 1
UN 0494 — Jet perforating guns, charged, without detonator
Placard: Explosive 1.2D. 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 0494 Quick Details
UN 0494
Product name: Jet perforating guns, charged, without detonator
DOT Class: 1
Placard type: Explosive 1.2D
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: isolate 500m in all directions; evacuate 1600m in all directions if fire or projection hazard exists; treat as mass explosion hazard
Common Hazards of UN 0494
- Projection and fragmentation hazard on initiation.
- Blast overpressure in immediate area.
- Sensitive to heat, shock, or electrical current.
- May initiate other explosives in proximity.
Chemical Identity & Physical Properties
| Also known as | shaped charge perforating gunswireline perforating gunsoil well perforating chargeswell completion perforators |
| Appearance | Tubular metal assemblies containing multiple shaped explosive charges designed for oil/gas well perforation. Charges are metallic cylinders with explosive cores and metal liners, typically gray or black in color. |
| 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; however, avoid contamination and maintain dry storage conditions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0494
Extinguishing Media
Do not use water or foam on explosives; use dry chemical or sand for small fires; evacuate area for large fires
PPE Requirements
⚠️ Level B minimum with fire-resistant clothing; full structural firefighting gear with SCBA for fire response; maintain maximum distance during handling
Isolation & Evacuation
ERG 112: isolate 500m in all directions; evacuate 1600m in all directions if fire or projection hazard exists; 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 0494 Incident
- CALL 911. Then call emergency response telephone number on shipping paper.
- Isolate minimum 500 meters; stage upwind and uphill.
- Request Hazmat + law enforcement immediately.
- Control ignition sources; deny unauthorized entry.
- Do not approach — projectile/fragmentation hazard.
- Consult current ERG Guide 112 and follow SOP/SOG.
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📋 Copy & Share Field Card
UN 0494 — Jet perforating guns, charged, without dHAZMAT RADIO NOTE — UN 0494
Product: Jet perforating guns, charged, without detonator
Class 1 / Explosive 1.2D / ERG 112
PPE: Level B minimum with fire-resistant clothing; full structural firefighting gear with SCBA for fire response; maintain maximum distance during handling
ISOLATION: ERG 112: isolate 500m in all directions; evacuate 1600m in all directions if fire or projection hazard exists; 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 0494 — Jet perforating guns, charged, without detonator
Class: 1 | Placard: Explosive 1.2D | ERG Guide: 112
Appearance: Tubular metal assemblies containing multiple shaped explosive charges designed for oil/gas well perforation. Charges are metallic cylinders with explosive cores and metal liners, typically gray or black in color.
Water Reactivity: No significant reaction with water; however, avoid contamination and maintain dry storage conditions
Extinguishing: Do not use water or foam on explosives; use dry chemical or sand for small fires; evacuate area for large fires
PPE: Level B minimum with fire-resistant clothing; full structural firefighting gear with SCBA for fire response; maintain maximum distance during handling
Isolation: ERG 112: isolate 500m in all directions; evacuate 1600m in all directions if fire or projection hazard exists; treat as mass explosion hazard
— Key Hazards —
• Projection and fragmentation hazard on initiation.
• Blast overpressure in immediate area.
• Sensitive to heat, shock, or electrical current.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Isolate minimum 500 meters; stage upwind and uphill.
• Request Hazmat + law enforcement immediately.
• Control ignition sources; deny unauthorized entry.
SOURCE: allfirefighter.com/hazmat/un/0494 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0494 Jet perforating guns, charged, without detonator Cls1 ERG112 | allfirefighter.com/hazmat/un/0494SMS / 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/0494
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 0494
Projection and fragmentation hazard on initiation. Blast overpressure in immediate area. Sensitive to heat, shock, or electrical current. May initiate other explosives in proximity.
CALL 911. Then call emergency response telephone number on shipping paper. Isolate minimum 500 meters; stage upwind and uphill. Request Hazmat + law enforcement immediately.
Level B minimum with fire-resistant clothing; full structural firefighting gear with SCBA for fire response; maintain maximum distance during handling
Water reactivity: No significant reaction with water; however, avoid contamination and maintain dry storage conditions. Recommended extinguishing: Do not use water or foam on explosives; use dry chemical or sand for small fires; evacuate area for large fires.
ERG Guide 112 recommendation: ERG 112: isolate 500m in all directions; evacuate 1600m in all directions if fire or projection hazard exists; 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.