☣️ UN 1698 • CLASS 6
Diphenylamine chloroarsine
Placard: Toxic. 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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Quick details
UN 1698
Class: 6
Placard type: Toxic
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: isolate spill/leak area immediately at least 25m in all directions; evacuate downwind 300m for small spills, 800m for large spills or fire
Chemical & Response Details
| Also known as | AdamsiteDMPhenarsazine chloride10-Chloro-5,10-dihydrophenarsazineDiphenylaminechloroarsine |
| CAS Number | 712-48-1 |
| Appearance | Yellow-green to dark green crystalline solid with a peppery or garlic-like odor. Odorless when pure. May appear as a smoke or aerosol when dispersed. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | 410°C (770°F) with decomposition |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Hydrolyzes slowly in water; no violent reaction but may release toxic arsenic compounds over time |
| Extinguishing | Water spray for cooling only; dry chemical, CO2, or sand for small fires |
| PPE | ⚠️ Level A required for unknown concentrations or aerosol; full encapsulation, SCBA, chemical-resistant suit; avoid all skin and eye contact |
| Isolation | ERG 154: isolate spill/leak area immediately at least 25m in all directions; evacuate downwind 300m for small spills, 800m for large spills or fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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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UN 1698 — Diphenylamine chloroarsine HAZMAT RADIO NOTE — UN 1698
Product: Diphenylamine chloroarsine
Class 6 / Toxic / ERG 154
PPE: Level A required for unknown concentrations or aerosol; full encapsulation, SCBA, chemical-resistant suit; avoid all skin and eye contact
ISOLATION: ERG 154: isolate spill/leak area immediately at least 25m in all directions; evacuate downwind 300m for small spills, 800m for large spills or fire
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 1698 — Diphenylamine chloroarsine
Class: 6 | Placard: Toxic | ERG Guide: 154
Appearance: Yellow-green to dark green crystalline solid with a peppery or garlic-like odor. Odorless when pure. May appear as a smoke or aerosol when dispersed.
Water Reactivity: Hydrolyzes slowly in water; no violent reaction but may release toxic arsenic compounds over time
Extinguishing: Water spray for cooling only; dry chemical, CO2, or sand for small fires
PPE: Level A required for unknown concentrations or aerosol; full encapsulation, SCBA, chemical-resistant suit; avoid all skin and eye contact
Isolation: ERG 154: isolate spill/leak area immediately at least 25m in all directions; evacuate downwind 300m for small spills, 800m for large spills or fire
— 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/1698 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1698 Diphenylamine chloroarsine Cls6 ERG154 | allfirefighter.com/hazmat/un/1698SMS / 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/1698
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FAQ
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 A required for unknown concentrations or aerosol; full encapsulation, SCBA, chemical-resistant suit; avoid all skin and eye contact
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.