☣️ UN 1607 • CLASS 6
UN 1607 — Ferric arsenite
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.
Ferric arsenite is a highly toxic substance that can be fatal if inhaled, ingested, or absorbed through skin. It is a brown to reddish-brown powder or solid with no characteristic odor.
Hazard overview: Ferric arsenite is highly toxic and may be fatal if inhaled, ingested, or absorbed through skin. Avoid any skin contact.
Response guidance: Isolate the spill area and protect personnel from exposure. Use dry chemical, sand, or dry earth for spill response.
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UN 1607 Quick Details
UN 1607
Product name: Ferric arsenite
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m initially and protect personnel
Common Hazards of UN 1607
- 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
Ferric arsenite is a brown to reddish-brown powder or solid with no characteristic odor. It exists as a solid at room temperature.
| Also known as | Iron arseniteFerric arsenite mixtureIron(III) arseniteArsenous acid iron(III) salt |
| CAS Number | 63989-69-5 |
| Appearance | Brown to reddish-brown powder or solid with no characteristic odor. Exists as a solid at room temperature. |
| Flash Point | Not applicable (non-flammable inorganic solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid, non-volatile) |
| Water Reactivity | Slightly soluble in water; may release toxic arsenic compounds upon prolonged contact with moisture |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1607
Extinguishing Media
Dry chemical, sand, or dry earth; water spray may be used to cool containers but avoid contact with material
PPE Requirements
⚠️ Level A or B required; full-face SCBA, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity
Level A or B required; full-face SCBA, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity.
Isolation & Evacuation
ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m initially and protect personnel
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 1607 Incident
- 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 1607 — Ferric arseniteHAZMAT RADIO NOTE — UN 1607
Product: Ferric arsenite
Class 6 / Toxic / ERG 151
PPE: Level A or B required; full-face SCBA, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity
ISOLATION: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m initially and protect personnel
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 1607 — Ferric arsenite
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Brown to reddish-brown powder or solid with no characteristic odor. Exists as a solid at room temperature.
Water Reactivity: Slightly soluble in water; may release toxic arsenic compounds upon prolonged contact with moisture
Extinguishing: Dry chemical, sand, or dry earth; water spray may be used to cool containers but avoid contact with material
PPE: Level A or B required; full-face SCBA, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity
Isolation: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m initially and protect personnel
— 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/ferric-arsenite-un-1607 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1607 Ferric arsenite Cls6 ERG151 | allfirefighter.com/hazmat/un/ferric-arsenite-un-1607SMS / 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/ferric-arsenite-un-1607
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Frequently Asked Questions about UN 1607
No, ferric arsenite is non-combustible.
Level A or B required; full-face SCBA, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity.
Isolate the spill area at least 25-50m in all directions; if fire or large spill, isolate 800m initially and protect personnel.
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.