☣️ 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.
🚒☣️
⚠️ 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 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
| 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
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
- 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 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 —
• 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/1607 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1607 Ferric arsenite Cls6 ERG151 | ERG 151: isolate spill area at least 25-50m in all directions; if fire or large | allfirefighter.com/hazmat/un/1607SMS / 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/1607
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Frequently Asked Questions about 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.
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, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity
Water reactivity: Slightly soluble in water; may release toxic arsenic compounds upon prolonged contact with moisture. Recommended extinguishing: Dry chemical, sand, or dry earth; water spray may be used to cool containers but avoid contact with material.
ERG Guide 151 recommendation: ERG 151: isolate spill area at least 25-50m in all directions; if fire or large spill, isolate 800m initially and protect personnel
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.