☣️ UN 0402 • CLASS 1
UN 0402 — Ammonium perchlorate
Placard: Explosive 1.1D. 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 0402 Quick Details
UN 0402
Product name: Ammonium perchlorate
DOT Class: 1
Placard type: Explosive 1.1D
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in fire isolate 1600m and consider evacuation
Common Hazards of UN 0402
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
Chemical Identity & Physical Properties
| Also known as | Perchloric acid ammonium saltAmmonium salt of perchloric acidAP |
| CAS Number | 7790-98-9 |
| Appearance | White crystalline solid or powder, odorless. Stable at room temperature but becomes hazardous when heated or subjected to shock. |
| Flash Point | Not applicable (oxidizing solid, does not burn but supports combustion) |
| Boiling Point | Not applicable (decomposes at approximately 200C/392F before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but dissolved material remains oxidizing and hazardous |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0402
Extinguishing Media
Do not use water or foam; use dry sand or dry chemical if small fire; evacuate and let large fires burn
PPE Requirements
⚠️ Level A recommended for fire or large spill; full structural firefighter protective clothing with SCBA for all operations
Isolation & Evacuation
ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in fire isolate 1600m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0402 Incident
- 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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📋 Copy & Share Field Card
UN 0402 — Ammonium perchlorateHAZMAT RADIO NOTE — UN 0402
Product: Ammonium perchlorate
Class 1 / Explosive 1.1D / ERG 112
PPE: Level A recommended for fire or large spill; full structural firefighter protective clothing with SCBA for all operations
ISOLATION: ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in fire isolate 1600m and consider evacuation
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 0402 — Ammonium perchlorate
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: White crystalline solid or powder, odorless. Stable at room temperature but becomes hazardous when heated or subjected to shock.
Water Reactivity: Soluble in water; no violent reaction but dissolved material remains oxidizing and hazardous
Extinguishing: Do not use water or foam; use dry sand or dry chemical if small fire; evacuate and let large fires burn
PPE: Level A recommended for fire or large spill; full structural firefighter protective clothing with SCBA for all operations
Isolation: ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in fire isolate 1600m and consider evacuation
— 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/0402 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0402 Ammonium perchlorate Cls1 ERG112 | ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in | allfirefighter.com/hazmat/un/0402SMS / 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/0402
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 0402
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 A recommended for fire or large spill; full structural firefighter protective clothing with SCBA for all operations
Water reactivity: Soluble in water; no violent reaction but dissolved material remains oxidizing and hazardous. Recommended extinguishing: Do not use water or foam; use dry sand or dry chemical if small fire; evacuate and let large fires burn.
ERG Guide 112 recommendation: ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in fire isolate 1600m and consider evacuation
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.