☣️ UN 1806 • CLASS 8
UN 1806 — Phosphorus pentachloride
Placard: Corrosive. ERG Guide 137. 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 1806 Quick Details
UN 1806
Product name: Phosphorus pentachloride
DOT Class: 8
Placard type: Corrosive
ERG Guide: 137 (check current ERG)
Initial isolation: ERG 137: Isolate spill area immediate 25m (80ft) in all directions. Large spill: consider initial downwind evacuation at least 100m (330ft). If fire involved, isolate 800m (0.5 miles) in all directions.
Common Hazards of UN 1806
- CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
- Fire will produce irritating, corrosive and/or toxic gases.
- Reaction with water may generate much heat that will increase the concentration of fumes in the air.
- Contact with molten substance may cause severe burns to skin and eyes.
- Runoff from fire control or dilution water may cause environmental contamination.
- EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff.
Chemical Identity & Physical Properties
| Also known as | PCl5Phosphoric chloridePhosphorus(V) chloridePentachlorophosphorus |
| CAS Number | 10026-13-8 |
| Appearance | White to pale yellow crystalline solid with a pungent, irritating odor. Fumes in moist air due to reaction with atmospheric moisture. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | 160C (320F) sublimes |
| Vapor Density | Not applicable (solid, but hydrolyzes to form HCl gas which is heavier than air) |
| Water Reactivity | Reacts violently with water, producing heat and toxic/corrosive hydrogen chloride and phosphoric acid fumes. Do not use water directly on material. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1806
Extinguishing Media
Dry chemical, dry sand, soda ash. DO NOT use water or foam. CO2 may be used at a distance.
PPE Requirements
⚠️ Level B minimum with full-face SCBA required. Acid-resistant protective clothing, butyl or neoprene gloves. Avoid contact and inhalation of fumes.
Isolation & Evacuation
ERG 137: Isolate spill area immediate 25m (80ft) in all directions. Large spill: consider initial downwind evacuation at least 100m (330ft). If fire involved, isolate 800m (0.5 miles) in all directions.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 137).
First Actions for a UN 1806 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 1806 — Phosphorus pentachlorideHAZMAT RADIO NOTE — UN 1806
Product: Phosphorus pentachloride
Class 8 / Corrosive / ERG 137
PPE: Level B minimum with full-face SCBA required. Acid-resistant protective clothing, butyl or neoprene gloves. Avoid contact and inhalation of fumes.
ISOLATION: ERG 137: Isolate spill area immediate 25m (80ft) in all directions. Large spill: consider initial downwind evacuation at least 100m (330ft). If fire involved, isolate 800m (0.5 miles) in all directions.
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 1806 — Phosphorus pentachloride
Class: 8 | Placard: Corrosive | ERG Guide: 137
Appearance: White to pale yellow crystalline solid with a pungent, irritating odor. Fumes in moist air due to reaction with atmospheric moisture.
Water Reactivity: Reacts violently with water, producing heat and toxic/corrosive hydrogen chloride and phosphoric acid fumes. Do not use water directly on material.
Extinguishing: Dry chemical, dry sand, soda ash. DO NOT use water or foam. CO2 may be used at a distance.
PPE: Level B minimum with full-face SCBA required. Acid-resistant protective clothing, butyl or neoprene gloves. Avoid contact and inhalation of fumes.
Isolation: ERG 137: Isolate spill area immediate 25m (80ft) in all directions. Large spill: consider initial downwind evacuation at least 100m (330ft). If fire involved, isolate 800m (0.5 miles) in all directions.
— Key Hazards —
• CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
• Fire will produce irritating, corrosive and/or toxic gases.
• Reaction with water may generate much heat that will increase the concentration of fumes in the air.
— 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/1806 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1806 Phosphorus pentachloride Cls8 ERG137 | allfirefighter.com/hazmat/un/1806SMS / 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/1806
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Frequently Asked Questions about UN 1806
CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance Fire will produce irritating, corrosive and/or toxic gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Contact with molten substance may cause severe burns to skin and eyes. Runoff from fire control or dilution water may cause environmental contamination. EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may May ignite combustibles (wood, paper, oil, clothing, etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff.
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 B minimum with full-face SCBA required. Acid-resistant protective clothing, butyl or neoprene gloves. Avoid contact and inhalation of fumes.
Water reactivity: Reacts violently with water, producing heat and toxic/corrosive hydrogen chloride and phosphoric acid fumes. Do not use water directly on material.. Recommended extinguishing: Dry chemical, dry sand, soda ash. DO NOT use water or foam. CO2 may be used at a distance..
ERG Guide 137 recommendation: ERG 137: Isolate spill area immediate 25m (80ft) in all directions. Large spill: consider initial downwind evacuation at least 100m (330ft). If fire involved, isolate 800m (0.5 miles) in all directions.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 137 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.