☣️ UN 2199 • CLASS 2
Phosphine
Placard: Toxic Gas. 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 2199
Class: 2
Placard type: Toxic Gas
ERG: Guide 119 (check current ERG)
Isolation: ERG 119: isolate spill/leak area immediately for at least 100m in all directions; large spill: consider initial evacuation 800m downwind
Chemical & Response Details
| Also known as | Hydrogen phosphidePhosphorus trihydridePH3Phosphorated hydrogen |
| CAS Number | 7803-51-2 |
| Appearance | Colorless gas with a fish-like or garlic-like odor. Highly toxic and flammable. May appear as a compressed liquefied gas. |
| Flash Point | Not applicable (flammable gas, ignites spontaneously in air above 100°F/38°C) |
| Boiling Point | -88°C (-126°F) |
| Vapor Density | 1.2 (heavier than air) |
| Water Reactivity | Slight hydrolysis in water; phosphine itself has limited water reactivity but may form flammable hydrogen gas |
| Extinguishing | Do not use water or foam; use dry chemical or CO2 if feasible, but evacuation is primary response |
| PPE | ⚠️ Level A required; SCBA with full-face positive pressure and fully encapsulating chemical-resistant suit; extremely toxic by inhalation |
| Isolation | ERG 119: isolate spill/leak area immediately for at least 100m in all directions; large spill: consider initial evacuation 800m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Flammable; may be ignited by heat, sparks or flames.
- May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
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.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- 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 2199 — Phosphine HAZMAT RADIO NOTE — UN 2199
Product: Phosphine
Class 2 / Toxic Gas / ERG 119
PPE: Level A required; SCBA with full-face positive pressure and fully encapsulating chemical-resistant suit; extremely toxic by inhalation
ISOLATION: ERG 119: isolate spill/leak area immediately for at least 100m in all directions; large spill: consider initial evacuation 800m downwind
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 2199 — Phosphine
Class: 2 | Placard: Toxic Gas | ERG Guide: 119
Appearance: Colorless gas with a fish-like or garlic-like odor. Highly toxic and flammable. May appear as a compressed liquefied gas.
Water Reactivity: Slight hydrolysis in water; phosphine itself has limited water reactivity but may form flammable hydrogen gas
Extinguishing: Do not use water or foam; use dry chemical or CO2 if feasible, but evacuation is primary response
PPE: Level A required; SCBA with full-face positive pressure and fully encapsulating chemical-resistant suit; extremely toxic by inhalation
Isolation: ERG 119: isolate spill/leak area immediately for at least 100m in all directions; large spill: consider initial evacuation 800m downwind
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
• Fire will produce irritating, corrosive and/or toxic gases.
— 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.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/2199 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2199 Phosphine Cls2 ERG119 | ERG 119: isolate spill/leak area immediately for at least 100m in all directions | allfirefighter.com/hazmat/un/2199SMS / 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/2199
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FAQ
TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground.
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; SCBA with full-face positive pressure and fully encapsulating chemical-resistant suit; extremely toxic by inhalation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 119 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.