☣️ UN 1419 • CLASS 4
UN 1419 — Magnesium aluminum phosphide
Placard: Dangerous When Wet. ERG Guide 139. 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 1419 Quick Details
UN 1419
Product name: Magnesium aluminum phosphide
DOT Class: 4
Placard type: Dangerous When Wet
ERG Guide: 139 (check current ERG)
Initial isolation: ERG 139: isolate spill 25m in all directions; large spill isolate 800m downwind; evacuate if fire threatens containers
Common Hazards of UN 1419
- Produce flammable and toxic gases on contact with water.
- May ignite on contact with water or moist air.
- Some react vigorously or explosively on contact with water.
- May be ignited by heat, sparks or flames.
- May re-ignite after fire is extinguished.
- Some are transported in highly flammable liquids.
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
Chemical Identity & Physical Properties
| Also known as | Magnesium aluminium phosphideMgAlPPhosphide of magnesium and aluminumMetal phosphide mixture |
| Appearance | Gray to dark gray granular solid or powder. May have a slight phosphine or garlic-like odor, especially when exposed to moisture. Solid at room temperature. |
| Flash Point | Not applicable (reactive solid, ignites on contact with water) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid; phosphine gas produced is 1.2, heavier than air) |
| Water Reactivity | Reacts violently with water or moisture, producing highly toxic and flammable phosphine gas (PH3). May spontaneously ignite. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1419
Extinguishing Media
Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2. Keep material dry.
PPE Requirements
⚠️ Level A required if exposure to phosphine gas possible; SCBA mandatory; chemical-resistant suit; prevent any moisture contact
Isolation & Evacuation
ERG 139: isolate spill 25m in all directions; large spill isolate 800m downwind; evacuate if fire threatens containers
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 139).
First Actions for a UN 1419 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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 1419 — Magnesium aluminum phosphideHAZMAT RADIO NOTE — UN 1419
Product: Magnesium aluminum phosphide
Class 4 / Dangerous When Wet / ERG 139
PPE: Level A required if exposure to phosphine gas possible; SCBA mandatory; chemical-resistant suit; prevent any moisture contact
ISOLATION: ERG 139: isolate spill 25m in all directions; large spill isolate 800m downwind; 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 1419 — Magnesium aluminum phosphide
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 139
Appearance: Gray to dark gray granular solid or powder. May have a slight phosphine or garlic-like odor, especially when exposed to moisture. Solid at room temperature.
Water Reactivity: Reacts violently with water or moisture, producing highly toxic and flammable phosphine gas (PH3). May spontaneously ignite.
Extinguishing: Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2. Keep material dry.
PPE: Level A required if exposure to phosphine gas possible; SCBA mandatory; chemical-resistant suit; prevent any moisture contact
Isolation: ERG 139: isolate spill 25m in all directions; large spill isolate 800m downwind; evacuate if fire threatens containers
— Key Hazards —
• Produce flammable and toxic gases on contact with water.
• May ignite on contact with water or moist air.
• Some react vigorously or explosively on contact with water.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/1419 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1419 Magnesium aluminum phosphide Cls4 ERG139 | allfirefighter.com/hazmat/un/1419SMS / 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/1419
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Frequently Asked Questions about UN 1419
Produce flammable and toxic gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Containers may explode when heated. Runoff may create fire or explosion hazard.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level A required if exposure to phosphine gas possible; SCBA mandatory; chemical-resistant suit; prevent any moisture contact
Water reactivity: Reacts violently with water or moisture, producing highly toxic and flammable phosphine gas (PH3). May spontaneously ignite.. Recommended extinguishing: Dry sand, dry chemical, soda ash. DO NOT use water, foam, or CO2. Keep material dry..
ERG Guide 139 recommendation: ERG 139: isolate spill 25m in all directions; large spill isolate 800m downwind; evacuate if fire threatens containers
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 139 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.