☣️ UN 2473 • CLASS 6
UN 2473 — Sodium arsanilate
Placard: Toxic. ERG Guide 154. 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 2473 Quick Details
UN 2473
Product name: Sodium arsanilate
DOT Class: 6
Placard type: Toxic
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: Initial isolation 25m in all directions; for large spills isolate 50m and consider evacuation 150m downwind; toxic arsenic compounds require containment
Common Hazards of UN 2473
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- 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
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
Chemical Identity & Physical Properties
| Also known as | Arsanilic acid sodium saltSodium 4-aminophenylarsonateSodium p-arsanilate4-Aminophenylarsonic acid sodium salt |
| CAS Number | 127-85-5 |
| Appearance | White to grayish-white crystalline powder or granular solid. Odorless. Soluble in water. |
| Flash Point | Not applicable (non-combustible solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water; forms toxic solutions but no violent reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2473
Extinguishing Media
Water spray, dry chemical, CO2, or foam suitable for non-combustible toxic materials
PPE Requirements
⚠️ Level B minimum with SCBA; full chemical-resistant suit for spills; avoid all skin contact; nitrile or butyl rubber gloves required
Isolation & Evacuation
ERG 154: Initial isolation 25m in all directions; for large spills isolate 50m and consider evacuation 150m downwind; toxic arsenic compounds require containment
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 2473 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.
- 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
- 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 2473 — Sodium arsanilateHAZMAT RADIO NOTE — UN 2473
Product: Sodium arsanilate
Class 6 / Toxic / ERG 154
PPE: Level B minimum with SCBA; full chemical-resistant suit for spills; avoid all skin contact; nitrile or butyl rubber gloves required
ISOLATION: ERG 154: Initial isolation 25m in all directions; for large spills isolate 50m and consider evacuation 150m downwind; toxic arsenic compounds require containment
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 2473 — Sodium arsanilate
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: White to grayish-white crystalline powder or granular solid. Odorless. Soluble in water.
Water Reactivity: Soluble in water; forms toxic solutions but no violent reaction
Extinguishing: Water spray, dry chemical, CO2, or foam suitable for non-combustible toxic materials
PPE: Level B minimum with SCBA; full chemical-resistant suit for spills; avoid all skin contact; nitrile or butyl rubber gloves required
Isolation: ERG 154: Initial isolation 25m in all directions; for large spills isolate 50m and consider evacuation 150m downwind; toxic arsenic compounds require containment
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/2473 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2473 Sodium arsanilate Cls6 ERG154 | ERG 154: Initial isolation 25m in all directions; for large spills isolate 50m a | allfirefighter.com/hazmat/un/2473SMS / 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/2473
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Frequently Asked Questions about UN 2473
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. 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 Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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 B minimum with SCBA; full chemical-resistant suit for spills; avoid all skin contact; nitrile or butyl rubber gloves required
Water reactivity: Soluble in water; forms toxic solutions but no violent reaction. Recommended extinguishing: Water spray, dry chemical, CO2, or foam suitable for non-combustible toxic materials.
ERG Guide 154 recommendation: ERG 154: Initial isolation 25m in all directions; for large spills isolate 50m and consider evacuation 150m downwind; toxic arsenic compounds require containment
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.