☣️ UN 1701 • CLASS 6
UN 1701 — Xylyl bromide, liquid
Placard: Toxic. ERG Guide 152. 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 1701 Quick Details
UN 1701
Product name: Xylyl bromide, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: Isolate spill 50m all directions; evacuate 800m downwind if large spill; toxic vapor cloud hazard
Common Hazards of UN 1701
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Combustible material: may burn but does not ignite readily.
- Containers may explode when heated.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
Chemical Identity & Physical Properties
| Also known as | alpha-bromo-xylenexylene dibromidebromoxylenemethylbenzyl bromidebromomethyltoluene |
| Appearance | Colorless to pale yellow liquid with a pungent, irritating odor. Lachrymator (tear gas agent). Dense liquid that may be shipped molten. |
| Flash Point | 110-113C (230-235F) depending on isomer |
| Boiling Point | 212-220C (414-428F) depending on isomer |
| Vapor Density | 6.4 (much heavier than air) |
| Water Reactivity | Decomposes slowly in water producing HBr; avoid prolonged contact with moisture |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1701
Extinguishing Media
Dry chemical, CO2, alcohol-resistant foam; water spray for cooling only
PPE Requirements
⚠️ Level A required; full encapsulation with SCBA; butyl rubber gloves minimum; lachrymator causes severe eye/respiratory irritation
Isolation & Evacuation
ERG 152: Isolate spill 50m all directions; evacuate 800m downwind if large spill; toxic vapor cloud hazard
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 1701 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 1701 — Xylyl bromide, liquidHAZMAT RADIO NOTE — UN 1701
Product: Xylyl bromide, liquid
Class 6 / Toxic / ERG 152
PPE: Level A required; full encapsulation with SCBA; butyl rubber gloves minimum; lachrymator causes severe eye/respiratory irritation
ISOLATION: ERG 152: Isolate spill 50m all directions; evacuate 800m downwind if large spill; toxic vapor cloud hazard
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 1701 — Xylyl bromide, liquid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Colorless to pale yellow liquid with a pungent, irritating odor. Lachrymator (tear gas agent). Dense liquid that may be shipped molten.
Water Reactivity: Decomposes slowly in water producing HBr; avoid prolonged contact with moisture
Extinguishing: Dry chemical, CO2, alcohol-resistant foam; water spray for cooling only
PPE: Level A required; full encapsulation with SCBA; butyl rubber gloves minimum; lachrymator causes severe eye/respiratory irritation
Isolation: ERG 152: Isolate spill 50m all directions; evacuate 800m downwind if large spill; toxic vapor cloud hazard
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• 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.
• 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/1701 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1701 Xylyl bromide, liquid Cls6 ERG152 | ERG 152: Isolate spill 50m all directions; evacuate 800m downwind if large spill | allfirefighter.com/hazmat/un/1701SMS / 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/1701
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Frequently Asked Questions about UN 1701
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Combustible material: may burn but does not ignite readily. Containers may explode when heated. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
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; full encapsulation with SCBA; butyl rubber gloves minimum; lachrymator causes severe eye/respiratory irritation
Water reactivity: Decomposes slowly in water producing HBr; avoid prolonged contact with moisture. Recommended extinguishing: Dry chemical, CO2, alcohol-resistant foam; water spray for cooling only.
ERG Guide 152 recommendation: ERG 152: Isolate spill 50m all directions; evacuate 800m downwind if large spill; toxic vapor cloud hazard
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 152 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.