☣️ UN 0402 • CLASS 1
Ammonium perchlorate
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 0402
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: Isolate spill 500m all directions; if tank/rail/tank truck involved in fire isolate 1600m and consider evacuation
Chemical & Response Details
| 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 |
| 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 |
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 0402 — Ammonium perchlorate HAZMAT 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 (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 A recommended for fire or large spill; full structural firefighter protective clothing with SCBA for all operations
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.