☣️ UN 1707 • CLASS 6
UN 1707 — Thallium compound, n.o.s.
Placard: Toxic. ERG Guide 151. 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 1707 Quick Details
UN 1707
Product name: Thallium compound, n.o.s.
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25-50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
Common Hazards of UN 1707
- 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 | Thallium saltsThallous compoundsThallic compoundsThallium derivatives |
| Appearance | Variable appearance depending on specific compound; typically white to colorless crystalline solids or powders, some compounds may be gray or yellowish. Generally odorless. |
| Flash Point | Not applicable (inorganic compounds) |
| Boiling Point | Variable depending on specific compound; many decompose before boiling |
| Vapor Density | Not applicable (solid compounds) |
| Water Reactivity | No significant reaction with water for most thallium compounds; some may be water-soluble |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1707
Extinguishing Media
Dry chemical, CO2, or water spray for fire involving thallium compounds; avoid dispersing material
PPE Requirements
⚠️ Level A or B required; full encapsulating suit, SCBA mandatory; nitrile or butyl rubber gloves; thallium is highly toxic by all routes of exposure
Isolation & Evacuation
ERG 151: isolate spill 25-50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 1707 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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UN 1707 — Thallium compound, n.o.s.HAZMAT RADIO NOTE — UN 1707
Product: Thallium compound, n.o.s.
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full encapsulating suit, SCBA mandatory; nitrile or butyl rubber gloves; thallium is highly toxic by all routes of exposure
ISOLATION: ERG 151: isolate spill 25-50m all directions; if fire involved, isolate 800m in all directions 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 1707 — Thallium compound, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Variable appearance depending on specific compound; typically white to colorless crystalline solids or powders, some compounds may be gray or yellowish. Generally odorless.
Water Reactivity: No significant reaction with water for most thallium compounds; some may be water-soluble
Extinguishing: Dry chemical, CO2, or water spray for fire involving thallium compounds; avoid dispersing material
PPE: Level A or B required; full encapsulating suit, SCBA mandatory; nitrile or butyl rubber gloves; thallium is highly toxic by all routes of exposure
Isolation: ERG 151: isolate spill 25-50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
— 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/1707 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1707 Thallium compound, n.o.s. Cls6 ERG151 | allfirefighter.com/hazmat/un/1707SMS / 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/1707
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Frequently Asked Questions about UN 1707
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 required; full encapsulating suit, SCBA mandatory; nitrile or butyl rubber gloves; thallium is highly toxic by all routes of exposure
Water reactivity: No significant reaction with water for most thallium compounds; some may be water-soluble. Recommended extinguishing: Dry chemical, CO2, or water spray for fire involving thallium compounds; avoid dispersing material.
ERG Guide 151 recommendation: ERG 151: isolate spill 25-50m all directions; if fire involved, isolate 800m in all directions and consider evacuation for 1600m downwind
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.