☣️ UN 1555 • CLASS 6
UN 1555 — Arsenic bromide
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 1555 Quick Details
UN 1555
Product name: Arsenic bromide
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25m in all directions; if tank/cargo involved in fire, isolate 800m in all directions
Common Hazards of UN 1555
- 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 | Arsenic tribromideArsenous bromideTribromoarsineAsBr3 |
| CAS Number | 7784-33-0 |
| Appearance | Colorless to pale yellow crystalline solid or lumps. Fumes in moist air with an acrid, irritating odor. |
| Flash Point | Not applicable (non-combustible solid) |
| Boiling Point | 221C (430F) |
| Vapor Density | Not applicable (solid, but vapors heavier than air when heated) |
| Water Reactivity | Reacts with water to produce toxic arsenic compounds and hydrogen bromide fumes |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1555
Extinguishing Media
Dry chemical, CO2, sand; avoid water due to reactivity
PPE Requirements
⚠️ Level A recommended for response; SCBA and full chemical protective suit required; avoid all skin contact
Isolation & Evacuation
ERG 151: isolate spill 25m in all directions; if tank/cargo involved in fire, isolate 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 1555 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 1555 — Arsenic bromideHAZMAT RADIO NOTE — UN 1555
Product: Arsenic bromide
Class 6 / Toxic / ERG 151
PPE: Level A recommended for response; SCBA and full chemical protective suit required; avoid all skin contact
ISOLATION: ERG 151: isolate spill 25m in all directions; if tank/cargo involved in fire, isolate 800m in all directions
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 1555 — Arsenic bromide
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Colorless to pale yellow crystalline solid or lumps. Fumes in moist air with an acrid, irritating odor.
Water Reactivity: Reacts with water to produce toxic arsenic compounds and hydrogen bromide fumes
Extinguishing: Dry chemical, CO2, sand; avoid water due to reactivity
PPE: Level A recommended for response; SCBA and full chemical protective suit required; avoid all skin contact
Isolation: ERG 151: isolate spill 25m in all directions; if tank/cargo involved in fire, isolate 800m in all directions
— 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/1555 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1555 Arsenic bromide Cls6 ERG151 | ERG 151: isolate spill 25m in all directions; if tank/cargo involved in fire, is | allfirefighter.com/hazmat/un/1555SMS / 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/1555
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Frequently Asked Questions about UN 1555
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 recommended for response; SCBA and full chemical protective suit required; avoid all skin contact
Water reactivity: Reacts with water to produce toxic arsenic compounds and hydrogen bromide fumes. Recommended extinguishing: Dry chemical, CO2, sand; avoid water due to reactivity.
ERG Guide 151 recommendation: ERG 151: isolate spill 25m in all directions; if tank/cargo involved in fire, isolate 800m in all directions
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.