☣️ UN 2727 • CLASS 6
Thallium nitrate
Placard: Toxic. 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.
Advertisement
Quick details
UN 2727
Class: 6
Placard type: Toxic
ERG: Guide 141 (check current ERG)
Isolation: ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300m downwind evacuation; fire: evacuate 800m radius
Chemical & Response Details
| Also known as | Thallous nitrateThallium(I) nitrateNitric acid thallium(1+) saltThallium mononitrate |
| CAS Number | 10102-45-1 |
| Appearance | Colorless to white crystalline solid, odorless. Deliquescent (absorbs moisture from air). |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Decomposes at 450C (842F) before boiling |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; no violent reaction but solution is highly toxic |
| Extinguishing | Water spray, CO2, dry chemical; avoid oxidizable materials |
| PPE | ⚠️ Level A or B required; SCBA mandatory; prevent all skin contact due to extreme toxicity |
| Isolation | ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300m downwind evacuation; fire: evacuate 800m radius |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- These substances will accelerate burning when involved in a fire.
- May explode from heat or contamination.
- Some may burn rapidly.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Toxic by ingestion.
First actions (field-minded)
- 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
- Consider initial downwind evacuation for at least 100 meters (330 feet).
Advertisement
📋 Copy & Share
UN 2727 — Thallium nitrate HAZMAT RADIO NOTE — UN 2727
Product: Thallium nitrate
Class 6 / Toxic / ERG 141
PPE: Level A or B required; SCBA mandatory; prevent all skin contact due to extreme toxicity
ISOLATION: ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300m downwind evacuation; fire: evacuate 800m radius
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 2727 — Thallium nitrate
Class: 6 | Placard: Toxic | ERG Guide: 141
Appearance: Colorless to white crystalline solid, odorless. Deliquescent (absorbs moisture from air).
Water Reactivity: Soluble in water; no violent reaction but solution is highly toxic
Extinguishing: Water spray, CO2, dry chemical; avoid oxidizable materials
PPE: Level A or B required; SCBA mandatory; prevent all skin contact due to extreme toxicity
Isolation: ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300m downwind evacuation; fire: evacuate 800m radius
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• May explode from heat or contamination.
• Some may burn rapidly.
— 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/2727 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2727 Thallium nitrate Cls6 ERG141 | ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300 | allfirefighter.com/hazmat/un/2727SMS / 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/2727
Advertisement
FAQ
These substances will accelerate burning when involved in a fire. May explode from heat or contamination. Some may burn rapidly. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Toxic by ingestion.
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 required; SCBA mandatory; prevent all skin contact due to extreme toxicity
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 141 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.