☣️ UN 0433 • CLASS 1
Powder cake, wetted
Placard: Explosive 1.1C. 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 0433
Class: 1
Placard type: Explosive 1.1C
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate 500m all directions; evacuate 1600m if fire or explosion risk; consider 800m fragmentation zone
Chemical & Response Details
| Also known as | Wetted powder cakeDampened explosive powderMoistened powder cakeWet explosive composition |
| Appearance | Compressed or molded explosive powder composition dampened with water or alcohol to reduce sensitivity. Typically appears as a cake or block form, color varies from white to brown depending on composition. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes/detonates) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Water is used as desensitizer; drying increases explosion hazard |
| Extinguishing | Water fog or spray to keep cool; no foam; avoid dry chemical |
| PPE | ⚠️ Level B minimum with SCBA; full structural firefighting gear; avoid all sources of ignition |
| Isolation | ERG 112: isolate 500m all directions; evacuate 1600m if fire or explosion risk; consider 800m fragmentation zone |
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 0433 — Powder cake, wetted HAZMAT RADIO NOTE — UN 0433
Product: Powder cake, wetted
Class 1 / Explosive 1.1C / ERG 112
PPE: Level B minimum with SCBA; full structural firefighting gear; avoid all sources of ignition
ISOLATION: ERG 112: isolate 500m all directions; evacuate 1600m if fire or explosion risk; consider 800m fragmentation zone
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 0433 — Powder cake, wetted
Class: 1 | Placard: Explosive 1.1C | ERG Guide: 112
Appearance: Compressed or molded explosive powder composition dampened with water or alcohol to reduce sensitivity. Typically appears as a cake or block form, color varies from white to brown depending on composition.
Water Reactivity: Water is used as desensitizer; drying increases explosion hazard
Extinguishing: Water fog or spray to keep cool; no foam; avoid dry chemical
PPE: Level B minimum with SCBA; full structural firefighting gear; avoid all sources of ignition
Isolation: ERG 112: isolate 500m all directions; evacuate 1600m if fire or explosion risk; consider 800m fragmentation zone
— 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/0433 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0433 Powder cake, wetted Cls1 ERG112 | ERG 112: isolate 500m all directions; evacuate 1600m if fire or explosion risk; | allfirefighter.com/hazmat/un/0433SMS / 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/0433
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.
Level B minimum with SCBA; full structural firefighting gear; avoid all sources of ignition
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.