☣️ UN 0305 • CLASS 1
Flash powder
Placard: Explosive 1.3G. 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 0305
Class: 1
Placard type: Explosive 1.3G
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: Initial isolation 500 meters (1600 feet) in all directions; if fire or large spill, evacuate 1600 meters (1 mile) downwind; treat as explosive hazard
Chemical & Response Details
| Also known as | Photoflash compositionPyrotechnic flash compositionMagnesium-based flash powderPerchlorate flash powder |
| Appearance | Fine gray to silver metallic powder mixture, typically consisting of aluminum or magnesium metal with an oxidizer (usually potassium perchlorate). Odorless in pure form. Appears as loose granular or powdered solid at room temperature. |
| Flash Point | Not applicable (pyrotechnic solid - ignites upon suitable initiation) |
| Boiling Point | Not applicable (decomposes/deflagrates upon heating) |
| Vapor Density | Not applicable (solid powder) |
| Water Reactivity | Avoid water contact with magnesium-based compositions; may react slowly producing hydrogen gas and heat |
| Extinguishing | Dry sand, dry chemical powder, or dry earth only; do NOT use water, foam, CO2, or halogenated agents on burning flash powder |
| PPE | ⚠️ Level B minimum with full face SCBA required; fire-resistant structural firefighting gear; shield protection recommended due to intense flash and heat projection risk |
| Isolation | ERG 112: Initial isolation 500 meters (1600 feet) in all directions; if fire or large spill, evacuate 1600 meters (1 mile) downwind; treat as explosive hazard |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Fire and burning hazard — not mass explosion.
- Intense heat and possible fragment projection.
- May deflagrate and initiate other materials.
- Smoke and toxic combustion products.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper.
- Isolate area; stage upwind — fire and fragment hazard.
- Request Hazmat + law enforcement.
- Control ignition sources; deny entry.
- Consult current ERG Guide 112 and follow SOP/SOG.
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UN 0305 — Flash powder HAZMAT RADIO NOTE — UN 0305
Product: Flash powder
Class 1 / Explosive 1.3G / ERG 112
PPE: Level B minimum with full face SCBA required; fire-resistant structural firefighting gear; shield protection recommended due to intense flash and heat projection risk
ISOLATION: ERG 112: Initial isolation 500 meters (1600 feet) in all directions; if fire or large spill, evacuate 1600 meters (1 mile) downwind; treat as explosive 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 0305 — Flash powder
Class: 1 | Placard: Explosive 1.3G | ERG Guide: 112
Appearance: Fine gray to silver metallic powder mixture, typically consisting of aluminum or magnesium metal with an oxidizer (usually potassium perchlorate). Odorless in pure form. Appears as loose granular or powdered solid at room temperature.
Water Reactivity: Avoid water contact with magnesium-based compositions; may react slowly producing hydrogen gas and heat
Extinguishing: Dry sand, dry chemical powder, or dry earth only; do NOT use water, foam, CO2, or halogenated agents on burning flash powder
PPE: Level B minimum with full face SCBA required; fire-resistant structural firefighting gear; shield protection recommended due to intense flash and heat projection risk
Isolation: ERG 112: Initial isolation 500 meters (1600 feet) in all directions; if fire or large spill, evacuate 1600 meters (1 mile) downwind; treat as explosive hazard
— Key Hazards —
• Fire and burning hazard — not mass explosion.
• Intense heat and possible fragment projection.
• May deflagrate and initiate other materials.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Isolate area; stage upwind — fire and fragment hazard.
• Request Hazmat + law enforcement.
• Control ignition sources; deny entry.
SOURCE: allfirefighter.com/hazmat/un/0305 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0305 Flash powder Cls1 ERG112 | ERG 112: Initial isolation 500 meters (1600 feet) in all directions; if fire or | allfirefighter.com/hazmat/un/0305SMS / 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/0305
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
Fire and burning hazard — not mass explosion. Intense heat and possible fragment projection. May deflagrate and initiate other materials. Smoke and toxic combustion products.
CALL 911. Then call emergency response telephone number on shipping paper. Isolate area; stage upwind — fire and fragment hazard. Request Hazmat + law enforcement.
Level B minimum with full face SCBA required; fire-resistant structural firefighting gear; shield protection recommended due to intense flash and heat projection risk
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.