☣️ UN 2574 • CLASS 6
UN 2574 — Tricresyl phosphate
Placard: Toxic. ERG Guide 151. 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 2574 Quick Details
UN 2574
Product name: Tricresyl phosphate
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill/leak area immediately for at least 50m in all directions; evacuate downwind 300m during fire
Common Hazards of UN 2574
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | TCPTritolyl phosphateTri-o-cresyl phosphatePhosphoric acid tricresyl esterTricresylphosphate |
| CAS Number | 1330-78-5 |
| Appearance | Colorless to pale yellow oily liquid with a mild phenolic odor. Viscous consistency at room temperature. |
| Flash Point | 225°C (437°F) |
| Boiling Point | 410°C (770°F) with decomposition |
| Vapor Density | 11.2 (much heavier than air) |
| Water Reactivity | No significant reaction with water; insoluble and will float on water surface |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2574
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, or water spray for cooling containers
PPE Requirements
⚠️ Level A or B minimum; full-face SCBA required; chemical-resistant suit mandatory due to severe dermal toxicity and absorption risk
Isolation & Evacuation
ERG 151: isolate spill/leak area immediately for at least 50m in all directions; evacuate downwind 300m during fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2574 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.
- 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 2574 — Tricresyl phosphateHAZMAT RADIO NOTE — UN 2574
Product: Tricresyl phosphate
Class 6 / Toxic / ERG 151
PPE: Level A or B minimum; full-face SCBA required; chemical-resistant suit mandatory due to severe dermal toxicity and absorption risk
ISOLATION: ERG 151: isolate spill/leak area immediately for at least 50m in all directions; evacuate downwind 300m during fire
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 2574 — Tricresyl phosphate
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Colorless to pale yellow oily liquid with a mild phenolic odor. Viscous consistency at room temperature.
Water Reactivity: No significant reaction with water; insoluble and will float on water surface
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, or water spray for cooling containers
PPE: Level A or B minimum; full-face SCBA required; chemical-resistant suit mandatory due to severe dermal toxicity and absorption risk
Isolation: ERG 151: isolate spill/leak area immediately for at least 50m in all directions; evacuate downwind 300m during fire
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may 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.
• 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/2574 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2574 Tricresyl phosphate Cls6 ERG151 | ERG 151: isolate spill/leak area immediately for at least 50m in all directions; | allfirefighter.com/hazmat/un/2574SMS / 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/2574
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Frequently Asked Questions about UN 2574
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Containers may explode when heated. Runoff may pollute waterways.
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 or B minimum; full-face SCBA required; chemical-resistant suit mandatory due to severe dermal toxicity and absorption risk
Water reactivity: No significant reaction with water; insoluble and will float on water surface. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, or water spray for cooling containers.
ERG Guide 151 recommendation: ERG 151: isolate spill/leak area immediately for at least 50m in all directions; evacuate downwind 300m during fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.