☣️ UN 2727 • CLASS 6
UN 2727 — Thallium nitrate
Placard: Toxic. ERG Guide 141. 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.
Thallium nitrate is highly toxic and oxidizing; ingestion, dust contact or contaminated runoff are serious concerns.
Hazard overview: Thallium nitrate should be treated as an oxidizing solid. It can make ordinary combustibles burn faster and may decompose violently if heated or contaminated.
Response guidance: Isolate the area, remove combustibles and keep contaminated runoff out of drains. Use water spray from a safe distance to cool containers; choose extinguishing agents based on the surrounding fire and SDS.
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UN 2727 Quick Details
UN 2727
Product name: Thallium nitrate
DOT Class: 6
Placard type: Toxic
ERG Guide: 141 (check current ERG)
Initial isolation: ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300m downwind evacuation; fire: evacuate 800m radius
Common Hazards of UN 2727
- Thallium nitrate is an oxidizer; it can intensify burning even though the material itself is not a fuel.
- Heat, shock, friction or contamination may cause rapid decomposition or explosion.
- Keep away from fuels, oils, paper, wood, clothing and other organic or reducing materials.
- Containers may rupture or explode when heated in a fire.
- Dust, solution or decomposition fumes may irritate or injure the eyes, skin and respiratory tract.
- Fire may produce toxic or irritating metal oxide and nitrogen/chlorine oxide fumes.
- Runoff can spread oxidizer contamination and increase fire or environmental hazards.
Chemical Identity & Physical Properties
Colorless to white crystalline solid, odorless. Deliquescent (absorbs moisture from air)
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2727
Extinguishing Media
Water spray, CO2, dry chemical; avoid oxidizable materials
PPE Requirements
⚠️ Level A or B required; SCBA mandatory; prevent all skin contact due to extreme toxicity
Use SCBA and chemical-protective clothing that prevents skin contact; thallium salts are extremely toxic and require strict contamination control.
Isolation & Evacuation
ERG 141: isolate spill 25m all directions; large spill isolate 50m, consider 300m downwind evacuation; fire: evacuate 800m radius
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 141).
First Actions for a UN 2727 Incident
- Call 911 and the emergency response number shown on the shipping papers.
- Keep unauthorized personnel away and deny entry to the spill or fire area.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Ventilate confined spaces only if personnel are trained, equipped and monitored.
- Use the ERG, SDS, shipping papers and air monitoring to set isolation, PPE and tactical decisions.
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📋 Copy & Share Field Card
UN 2727 — Thallium nitrateHAZMAT 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 —
• Thallium nitrate is an oxidizer; it can intensify burning even though the material itself is not a fuel.
• Heat, shock, friction or contamination may cause rapid decomposition or explosion.
• Keep away from fuels, oils, paper, wood, clothing and other organic or reducing materials.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers.
• Keep unauthorized personnel away and deny entry to the spill or fire area.
• Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
• Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
SOURCE: allfirefighter.com/hazmat/un/thallium-nitrate-un-2727 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2727 Thallium nitrate Cls6 ERG141 | allfirefighter.com/hazmat/un/thallium-nitrate-un-2727SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/thallium-nitrate-un-2727
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Frequently Asked Questions about UN 2727
UN 2727 is Thallium nitrate, regulated as an oxidizing hazardous material for transport and emergency response.
The main concern is an oxidizing hazardous material behavior plus exposure risk from dust, vapor, liquid or fire products.
Approach from upwind, isolate the area, keep nonessential people out and verify the exact product with shipping papers or SDS.
Water can dissolve the material and carry oxidizer contamination. Use controlled water spray for cooling and runoff control rather than washing material into drains.
Use SCBA and chemical-protective clothing that prevents skin contact; thallium salts are extremely toxic and require strict contamination control.
It can intensify nearby fires and release toxic or irritating decomposition fumes.
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.