☣️ UN 1442 • CLASS 5
UN 1442 — Ammonium perchlorate
Placard: Oxidizer. ERG Guide 143. 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.
Ammonium perchlorate is a white crystalline solid or powder that is used in various applications, including as a precursor to perchloric acid.
Hazard overview: Ammonium perchlorate may explode from friction, heat or contamination and can accelerate burning when involved in a fire. It can also release heat when dissolved in water.
Response guidance: In the event of a fire, use water spray to cool and dry chemical, CO2. Avoid organic materials.
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UN 1442 Quick Details
UN 1442
Product name: Ammonium perchlorate
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 143 (check current ERG)
Initial isolation: ERG 143: isolate 800m (0.5 mile) all directions for large spills; evacuate if fire threatens containers
Common Hazards of UN 1442
- May explode from friction, heat or contamination.
- These substances will accelerate burning when involved in a fire.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Some will react explosively with hydrocarbons (fuels).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe
- Fire may produce irritating and/or toxic gases.
Chemical Identity & Physical Properties
Ammonium perchlorate is a white crystalline solid or powder, odorless.
| Also known as | Perchloric acid ammonium saltAmmonium perchlorate (AP)Ammonium chlorate (VII)Perchloramin |
| CAS Number | 7790-98-9 |
| Appearance | White crystalline solid or powder, odorless. Stable at room temperature but becomes a powerful oxidizer when heated. |
| Flash Point | Not applicable (oxidizer solid) |
| Boiling Point | Decomposes at 200-240C (392-464F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but releases heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1442
Extinguishing Media
Water spray to cool, dry chemical, CO2; avoid organic materials
PPE Requirements
⚠️ Level B minimum; SCBA required; avoid friction/impact; static-dissipative gear recommended
Level B minimum; SCBA required; avoid friction/impact; static-dissipative gear recommended.
Isolation & Evacuation
ERG 143: isolate 800m (0.5 mile) all directions for large spills; evacuate if fire threatens containers
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 143).
First Actions for a UN 1442 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1442 — Ammonium perchlorateHAZMAT RADIO NOTE — UN 1442
Product: Ammonium perchlorate
Class 5 / Oxidizer / ERG 143
PPE: Level B minimum; SCBA required; avoid friction/impact; static-dissipative gear recommended
ISOLATION: ERG 143: isolate 800m (0.5 mile) all directions for large spills; evacuate if fire threatens containers
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 1442 — Ammonium perchlorate
Class: 5 | Placard: Oxidizer | ERG Guide: 143
Appearance: White crystalline solid or powder, odorless. Stable at room temperature but becomes a powerful oxidizer when heated.
Water Reactivity: Soluble in water; no violent reaction but releases heat
Extinguishing: Water spray to cool, dry chemical, CO2; avoid organic materials
PPE: Level B minimum; SCBA required; avoid friction/impact; static-dissipative gear recommended
Isolation: ERG 143: isolate 800m (0.5 mile) all directions for large spills; evacuate if fire threatens containers
— Key Hazards —
• May explode from friction, heat or contamination.
• These substances will accelerate burning when involved in a fire.
• May ignite combustibles (wood, paper, oil, clothing, etc.).
— First Actions —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/ammonium-perchlorate-un-1442 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1442 Ammonium perchlorate Cls5 ERG143 | allfirefighter.com/hazmat/un/ammonium-perchlorate-un-1442SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/ammonium-perchlorate-un-1442
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Frequently Asked Questions about UN 1442
Yes, UN 1442 Ammonium perchlorate may explode from friction, heat or contamination.
Yes, use dry chemical, CO2 for fires.
Level B minimum; SCBA required; avoid friction/impact; static-dissipative gear recommended.
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.