☣️ UN 2845 • CLASS 6
UN 2845 — Ethyl phosphonous dichloride, anhydrous
Placard: Toxic. ERG Guide 135. 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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UN 2845 Quick Details
UN 2845
Product name: Ethyl phosphonous dichloride, anhydrous
DOT Class: 6
Placard type: Toxic
ERG Guide: 135 (check current ERG)
Initial isolation: ERG 135: Initial isolation 60m all directions. Protective action distance 0.2km daytime/0.4km nighttime for small spills; 0.8km daytime/2.4km nighttime for large spills.
Common Hazards of UN 2845
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| Also known as | Ethylphosphonous dichlorideEthyl dichlorophosphineDichloroethylphosphineEthylphosphorous dichloride |
| CAS Number | 1498-51-7 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, irritating odor. Fumes in moist air due to hydrolysis reaction. |
| Flash Point | Not applicable (pyrophoric/water-reactive) |
| Boiling Point | 58-60C (136-140F) |
| Vapor Density | 4.1 (heavier than air) |
| Water Reactivity | Reacts violently with water producing toxic and flammable phosphine gas and hydrochloric acid. Do not use water except as fog for cooling. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2845
Extinguishing Media
Dry chemical, CO2, dry sand. No water or foam. Use water spray from distance only to cool containers.
PPE Requirements
⚠️ Level A required for spill response. SCBA with full-face positive pressure required. Chemical-resistant suit mandatory due to corrosive fumes.
Isolation & Evacuation
ERG 135: Initial isolation 60m all directions. Protective action distance 0.2km daytime/0.4km nighttime for small spills; 0.8km daytime/2.4km nighttime for large spills.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 135).
First Actions for a UN 2845 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- 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 2845 — Ethyl phosphonous dichloride, anhydrousHAZMAT RADIO NOTE — UN 2845
Product: Ethyl phosphonous dichloride, anhydrous
Class 6 / Toxic / ERG 135
PPE: Level A required for spill response. SCBA with full-face positive pressure required. Chemical-resistant suit mandatory due to corrosive fumes.
ISOLATION: ERG 135: Initial isolation 60m all directions. Protective action distance 0.2km daytime/0.4km nighttime for small spills; 0.8km daytime/2.4km nighttime for large spills.
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 2845 — Ethyl phosphonous dichloride, anhydrous
Class: 6 | Placard: Toxic | ERG Guide: 135
Appearance: Colorless to pale yellow fuming liquid with a pungent, irritating odor. Fumes in moist air due to hydrolysis reaction.
Water Reactivity: Reacts violently with water producing toxic and flammable phosphine gas and hydrochloric acid. Do not use water except as fog for cooling.
Extinguishing: Dry chemical, CO2, dry sand. No water or foam. Use water spray from distance only to cool containers.
PPE: Level A required for spill response. SCBA with full-face positive pressure required. Chemical-resistant suit mandatory due to corrosive fumes.
Isolation: ERG 135: Initial isolation 60m all directions. Protective action distance 0.2km daytime/0.4km nighttime for small spills; 0.8km daytime/2.4km nighttime for large spills.
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• 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/2845 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2845 Ethyl phosphonous dichloride, anhydrous Cls6 ERG135 | allfirefighter.com/hazmat/un/2845SMS / 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/2845
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Frequently Asked Questions about UN 2845
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level A required for spill response. SCBA with full-face positive pressure required. Chemical-resistant suit mandatory due to corrosive fumes.
Water reactivity: Reacts violently with water producing toxic and flammable phosphine gas and hydrochloric acid. Do not use water except as fog for cooling.. Recommended extinguishing: Dry chemical, CO2, dry sand. No water or foam. Use water spray from distance only to cool containers..
ERG Guide 135 recommendation: ERG 135: Initial isolation 60m all directions. Protective action distance 0.2km daytime/0.4km nighttime for small spills; 0.8km daytime/2.4km nighttime for large spills.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 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.