☣️ UN 2027 • CLASS 6
UN 2027 — Sodium arsenite, solid
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 2027 Quick Details
UN 2027
Product name: Sodium arsenite, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25-50m all directions; if fire or large spill, isolate 800m and evacuate 1600m downwind
Common Hazards of UN 2027
- 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 | Sodium arseniteArsenous acid sodium saltSodium metaarseniteNatrium arsenitePenite |
| CAS Number | 7784-46-5 |
| Appearance | White to grayish-white crystalline powder or granular solid. Odorless or slight garlic-like odor when impure. Hygroscopic (absorbs moisture from air). |
| Flash Point | Not applicable (non-combustible inorganic salt) |
| Boiling Point | Not applicable (decomposes at high temperature) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Dissolves in water forming toxic alkaline solution; no violent reaction but creates hazardous arsenic-containing solution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2027
Extinguishing Media
Water spray, dry chemical, CO2; avoid generating dust during firefighting
PPE Requirements
⚠️ Level A or B required; full-face SCBA mandatory; chemical-resistant suit, gloves, boots; prevent any skin contact due to extreme toxicity
Isolation & Evacuation
ERG 151: isolate spill 25-50m all directions; if fire or large spill, isolate 800m and evacuate 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2027 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 2027 — Sodium arsenite, solidHAZMAT RADIO NOTE — UN 2027
Product: Sodium arsenite, solid
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full-face SCBA mandatory; chemical-resistant suit, gloves, boots; prevent any skin contact due to extreme toxicity
ISOLATION: ERG 151: isolate spill 25-50m all directions; if fire or large spill, isolate 800m and evacuate 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 2027 — Sodium arsenite, solid
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White to grayish-white crystalline powder or granular solid. Odorless or slight garlic-like odor when impure. Hygroscopic (absorbs moisture from air).
Water Reactivity: Dissolves in water forming toxic alkaline solution; no violent reaction but creates hazardous arsenic-containing solution
Extinguishing: Water spray, dry chemical, CO2; avoid generating dust during firefighting
PPE: Level A or B required; full-face SCBA mandatory; chemical-resistant suit, gloves, boots; prevent any skin contact due to extreme toxicity
Isolation: ERG 151: isolate spill 25-50m all directions; if fire or large spill, isolate 800m and evacuate 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/2027 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2027 Sodium arsenite, solid Cls6 ERG151 | ERG 151: isolate spill 25-50m all directions; if fire or large spill, isolate 80 | allfirefighter.com/hazmat/un/2027SMS / 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/2027
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Frequently Asked Questions about UN 2027
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-face SCBA mandatory; chemical-resistant suit, gloves, boots; prevent any skin contact due to extreme toxicity
Water reactivity: Dissolves in water forming toxic alkaline solution; no violent reaction but creates hazardous arsenic-containing solution. Recommended extinguishing: Water spray, dry chemical, CO2; avoid generating dust during firefighting.
ERG Guide 151 recommendation: ERG 151: isolate spill 25-50m all directions; if fire or large spill, isolate 800m and evacuate 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.