☣️ UN 2940 • CLASS 4
UN 2940 — Cyclooctadiene phosphines
Placard: Spontaneously Combustible. ERG Guide 135. 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 2940 Quick Details
UN 2940
Product name: Cyclooctadiene phosphines
DOT Class: 4
Placard type: Spontaneously Combustible
ERG Guide: 135 (check current ERG)
Initial isolation: ERG 135: isolate 25m in all directions; if tank/railcar involved in fire, isolate 800m all directions and evacuate 800m
Common Hazards of UN 2940
- 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 | Cyclooctadiene phosphinesCOD phosphine complexes1,5-Cyclooctadiene phosphine compounds |
| Appearance | Yellow to orange crystalline or powdery solid with a mild phosphine odor. Solid at room temperature, often moisture-sensitive. |
| Flash Point | Not applicable (pyrophoric solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with moisture and water, may ignite spontaneously on contact with moist air |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2940
Extinguishing Media
Dry chemical, dry sand, soda ash; no water or foam
PPE Requirements
⚠️ Level B minimum; SCBA required; full protective clothing to prevent skin contact
Isolation & Evacuation
ERG 135: isolate 25m in all directions; if tank/railcar involved in fire, isolate 800m all directions and evacuate 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 135).
First Actions for a UN 2940 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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📋 Copy & Share Field Card
UN 2940 — Cyclooctadiene phosphinesHAZMAT RADIO NOTE — UN 2940
Product: Cyclooctadiene phosphines
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum; SCBA required; full protective clothing to prevent skin contact
ISOLATION: ERG 135: isolate 25m in all directions; if tank/railcar involved in fire, isolate 800m all directions and evacuate 800m
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 2940 — Cyclooctadiene phosphines
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Yellow to orange crystalline or powdery solid with a mild phosphine odor. Solid at room temperature, often moisture-sensitive.
Water Reactivity: Reacts with moisture and water, may ignite spontaneously on contact with moist air
Extinguishing: Dry chemical, dry sand, soda ash; no water or foam
PPE: Level B minimum; SCBA required; full protective clothing to prevent skin contact
Isolation: ERG 135: isolate 25m in all directions; if tank/railcar involved in fire, isolate 800m all directions and evacuate 800m
— 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/2940 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2940 Cyclooctadiene phosphines Cls4 ERG135 | allfirefighter.com/hazmat/un/2940SMS / 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/2940
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Frequently Asked Questions about UN 2940
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 B minimum; SCBA required; full protective clothing to prevent skin contact
Water reactivity: Reacts with moisture and water, may ignite spontaneously on contact with moist air. Recommended extinguishing: Dry chemical, dry sand, soda ash; no water or foam.
ERG Guide 135 recommendation: ERG 135: isolate 25m in all directions; if tank/railcar involved in fire, isolate 800m all directions and evacuate 800m
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.