☣️ UN 1432 • CLASS 4
Sodium phosphide
Placard: Dangerous When Wet. 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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Quick details
UN 1432
Class: 4
Placard type: Dangerous When Wet
ERG: Guide 139 (check current ERG)
Isolation: ERG 139: Isolate spill 100m all directions. Evacuate immediate area if water contact occurs due to toxic phosphine gas generation. Downwind evacuation 800m+ if fire.
Chemical & Response Details
| Also known as | Trisodium phosphideSodium phosphide (Na3P)Phosphide de sodiumNatriumphosphid |
| CAS Number | 12058-85-4 |
| Appearance | Dark gray to black crystalline solid or powder. May have a slight phosphine odor when exposed to moisture. Solid at room temperature. |
| Flash Point | Not applicable (water-reactive solid) |
| Boiling Point | Not applicable (decomposes on contact with water) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts violently with water producing highly flammable and toxic phosphine gas (PH3). May ignite spontaneously on contact with moisture or humid air. |
| Extinguishing | Dry sand, dry chemical, dry graphite powder. Do NOT use water, foam, or CO2. Keep dry at all times. |
| PPE | ⚠️ Level A minimum for spill response. SCBA required. Full chemical-resistant suit. Avoid all moisture contact. Extreme caution in humid conditions. |
| Isolation | ERG 139: Isolate spill 100m all directions. Evacuate immediate area if water contact occurs due to toxic phosphine gas generation. Downwind evacuation 800m+ if fire. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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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UN 1432 — Sodium phosphide HAZMAT RADIO NOTE — UN 1432
Product: Sodium phosphide
Class 4 / Dangerous When Wet / ERG 139
PPE: Level A minimum for spill response. SCBA required. Full chemical-resistant suit. Avoid all moisture contact. Extreme caution in humid conditions.
ISOLATION: ERG 139: Isolate spill 100m all directions. Evacuate immediate area if water contact occurs due to toxic phosphine gas generation. Downwind evacuation 800m+ if fire.
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 1432 — Sodium phosphide
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 139
Appearance: Dark gray to black crystalline solid or powder. May have a slight phosphine odor when exposed to moisture. Solid at room temperature.
Water Reactivity: Reacts violently with water producing highly flammable and toxic phosphine gas (PH3). May ignite spontaneously on contact with moisture or humid air.
Extinguishing: Dry sand, dry chemical, dry graphite powder. Do NOT use water, foam, or CO2. Keep dry at all times.
PPE: Level A minimum for spill response. SCBA required. Full chemical-resistant suit. Avoid all moisture contact. Extreme caution in humid conditions.
Isolation: ERG 139: Isolate spill 100m all directions. Evacuate immediate area if water contact occurs due to toxic phosphine gas generation. Downwind evacuation 800m+ if fire.
— 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/1432 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1432 Sodium phosphide Cls4 ERG139 | ERG 139: Isolate spill 100m all directions. Evacuate immediate area if water con | allfirefighter.com/hazmat/un/1432SMS / 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/1432
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FAQ
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 minimum for spill response. SCBA required. Full chemical-resistant suit. Avoid all moisture contact. Extreme caution in humid conditions.
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.