☣️ UN 0042 • CLASS 1
Boosters, without detonator
Placard: Explosive 1.1D. 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.
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Quick details
UN 0042
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate 500m minimum all directions; if fire or explosion threat, evacuate 1600m radius; consider mass explosion hazard affecting entire area
Chemical & Response Details
| Also known as | Explosive boostersSupplementary chargesDetonating chargesHigh explosive boosters |
| Appearance | Solid explosive charges, typically cylindrical or rectangular blocks. May be yellow, white, or tan colored depending on composition. Used to amplify detonation from smaller initiating devices. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes/explodes) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Generally stable in water, but avoid contamination or moisture that could affect reliability |
| Extinguishing | Water from distance only; do not use foam, dry chemical, or CO2 on fires involving explosives |
| PPE | ⚠️ Full structural firefighting gear with SCBA; withdraw immediately if fire involves explosives; fight fire from maximum distance |
| Isolation | ERG 112: isolate 500m minimum all directions; if fire or explosion threat, evacuate 1600m radius; consider mass explosion hazard affecting entire area |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
First actions (field-minded)
- 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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UN 0042 — Boosters, without detonator HAZMAT RADIO NOTE — UN 0042
Product: Boosters, without detonator
Class 1 / Explosive 1.1D / ERG 112
PPE: Full structural firefighting gear with SCBA; withdraw immediately if fire involves explosives; fight fire from maximum distance
ISOLATION: ERG 112: isolate 500m minimum all directions; if fire or explosion threat, evacuate 1600m radius; consider mass explosion hazard affecting entire area
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 0042 — Boosters, without detonator
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: Solid explosive charges, typically cylindrical or rectangular blocks. May be yellow, white, or tan colored depending on composition. Used to amplify detonation from smaller initiating devices.
Water Reactivity: Generally stable in water, but avoid contamination or moisture that could affect reliability
Extinguishing: Water from distance only; do not use foam, dry chemical, or CO2 on fires involving explosives
PPE: Full structural firefighting gear with SCBA; withdraw immediately if fire involves explosives; fight fire from maximum distance
Isolation: ERG 112: isolate 500m minimum all directions; if fire or explosion threat, evacuate 1600m radius; consider mass explosion hazard affecting entire area
— 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/0042 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0042 Boosters, without detonator Cls1 ERG112 | allfirefighter.com/hazmat/un/0042SMS / 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/0042
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ
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.
Full structural firefighting gear with SCBA; withdraw immediately if fire involves explosives; fight fire from maximum distance
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.