☣️ UN 1699 • CLASS 6
UN 1699 — Diphenylchloroarsine, liquid
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 1699 Quick Details
UN 1699
Product name: Diphenylchloroarsine, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spills 300m+ downwind
Common Hazards of UN 1699
- 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 | Clark IDADiphenylarsine chlorideDiphenylchloroarsineBlue CrossPhenylarsine dichloride |
| CAS Number | 712-48-1 |
| Appearance | Colorless to dark brown oily liquid with a geranium-like or irritating odor. Vesicant and lachrymator agent. |
| Flash Point | Not applicable (non-flammable liquid) |
| Boiling Point | 333C (631F) with decomposition |
| Vapor Density | 9.4 (much heavier than air) |
| Water Reactivity | Hydrolyzes slowly in water, producing toxic and corrosive fumes |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1699
Extinguishing Media
Dry chemical, CO2, sand; avoid water spray on material due to hydrolysis concerns
PPE Requirements
⚠️ Level A required; SCBA with full face protection mandatory; chemical-resistant suit; avoid all contact
Isolation & Evacuation
ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spills 300m+ downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 1699 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 1699 — Diphenylchloroarsine, liquidHAZMAT RADIO NOTE — UN 1699
Product: Diphenylchloroarsine, liquid
Class 6 / Toxic / ERG 151
PPE: Level A required; SCBA with full face protection mandatory; chemical-resistant suit; avoid all contact
ISOLATION: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spills 300m+ 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 1699 — Diphenylchloroarsine, liquid
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Colorless to dark brown oily liquid with a geranium-like or irritating odor. Vesicant and lachrymator agent.
Water Reactivity: Hydrolyzes slowly in water, producing toxic and corrosive fumes
Extinguishing: Dry chemical, CO2, sand; avoid water spray on material due to hydrolysis concerns
PPE: Level A required; SCBA with full face protection mandatory; chemical-resistant suit; avoid all contact
Isolation: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spills 300m+ 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/1699 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1699 Diphenylchloroarsine, liquid Cls6 ERG151 | allfirefighter.com/hazmat/un/1699SMS / 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/1699
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Frequently Asked Questions about UN 1699
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 required; SCBA with full face protection mandatory; chemical-resistant suit; avoid all contact
Water reactivity: Hydrolyzes slowly in water, producing toxic and corrosive fumes. Recommended extinguishing: Dry chemical, CO2, sand; avoid water spray on material due to hydrolysis concerns.
ERG Guide 151 recommendation: ERG 151: isolate spill 25-50m all directions; evacuate immediate area; large spills 300m+ 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.