☣️ UN 3254 • CLASS 4
Tributylphosphane
Placard: Spontaneously Combustible. 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 3254
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate spill 25-50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation for 1600m downwind
Chemical & Response Details
| Also known as | TributylphosphineTri-n-butylphosphineTBPPhosphorous tributyln-Tributylphosphine |
| CAS Number | 998-40-3 |
| Appearance | Colorless to pale yellow liquid with a strong, unpleasant, garlic-like or phosphine odor. Pyrophoric properties may be present. |
| Flash Point | -7C (19F) |
| Boiling Point | 150C (302F) at 100 mmHg |
| Vapor Density | 6.8 (much heavier than air) |
| Water Reactivity | Reacts with moisture producing flammable phosphine gas; may ignite spontaneously in moist air |
| Extinguishing | Dry chemical, CO2, sand, or dry earth; do not use water or foam due to water reactivity |
| PPE | ⚠️ Level B minimum with SCBA required; full face protection and chemical-resistant suit due to pyrophoric nature and toxicity |
| Isolation | ERG 135: isolate spill 25-50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation for 1600m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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 3254 — Tributylphosphane HAZMAT RADIO NOTE — UN 3254
Product: Tributylphosphane
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum with SCBA required; full face protection and chemical-resistant suit due to pyrophoric nature and toxicity
ISOLATION: ERG 135: isolate spill 25-50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation for 1600m 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 3254 — Tributylphosphane
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Colorless to pale yellow liquid with a strong, unpleasant, garlic-like or phosphine odor. Pyrophoric properties may be present.
Water Reactivity: Reacts with moisture producing flammable phosphine gas; may ignite spontaneously in moist air
Extinguishing: Dry chemical, CO2, sand, or dry earth; do not use water or foam due to water reactivity
PPE: Level B minimum with SCBA required; full face protection and chemical-resistant suit due to pyrophoric nature and toxicity
Isolation: ERG 135: isolate spill 25-50m all directions; if tank/rail car involved in fire isolate 800m and consider evacuation for 1600m downwind
— 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/3254 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3254 Tributylphosphane Cls4 ERG135 | ERG 135: isolate spill 25-50m all directions; if tank/rail car involved in fire | allfirefighter.com/hazmat/un/3254SMS / 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/3254
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FAQ
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 with SCBA required; full face protection and chemical-resistant suit due to pyrophoric nature and toxicity
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.