☣️ UN 1048 • CLASS 2
UN 1048 — Hydrogen bromide, anhydrous
Placard: Toxic Gas. ERG Guide 125. 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 1048 Quick Details
UN 1048
Product name: Hydrogen bromide, anhydrous
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 125 (check current ERG)
Initial isolation: ERG 125: Small spill isolate 100m; large spill isolate 800m initial, protect 1.6km downwind day or 3.2km night
Common Hazards of UN 1048
- TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
- Vapors are extremely irritating and corrosive.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Some of these materials may react violently with water.
Chemical Identity & Physical Properties
| Also known as | HBrHydrobromic acid gasAnhydrous hydrobromic acidBromane |
| CAS Number | 10035-10-6 |
| Appearance | Colorless to faint yellow gas with a sharp, pungent, irritating odor. Fumes strongly in moist air forming white clouds of hydrobromic acid mist. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -67C (-88F) |
| Vapor Density | 2.8 (heavier than air) |
| Water Reactivity | Dissolves in water forming corrosive hydrobromic acid solution; exothermic reaction with heat generation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1048
Extinguishing Media
Non-flammable; water spray to reduce vapors, no foam needed
PPE Requirements
⚠️ Level A or B with SCBA required; full chemical protective suit; acid-resistant gloves and boots; eye and respiratory protection mandatory
Isolation & Evacuation
ERG 125: Small spill isolate 100m; large spill isolate 800m initial, protect 1.6km downwind day or 3.2km night
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 125).
First Actions for a UN 1048 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.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- 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 1048 — Hydrogen bromide, anhydrousHAZMAT RADIO NOTE — UN 1048
Product: Hydrogen bromide, anhydrous
Class 2 / Toxic Gas / ERG 125
PPE: Level A or B with SCBA required; full chemical protective suit; acid-resistant gloves and boots; eye and respiratory protection mandatory
ISOLATION: ERG 125: Small spill isolate 100m; large spill isolate 800m initial, protect 1.6km downwind day or 3.2km night
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 1048 — Hydrogen bromide, anhydrous
Class: 2 | Placard: Toxic Gas | ERG Guide: 125
Appearance: Colorless to faint yellow gas with a sharp, pungent, irritating odor. Fumes strongly in moist air forming white clouds of hydrobromic acid mist.
Water Reactivity: Dissolves in water forming corrosive hydrobromic acid solution; exothermic reaction with heat generation
Extinguishing: Non-flammable; water spray to reduce vapors, no foam needed
PPE: Level A or B with SCBA required; full chemical protective suit; acid-resistant gloves and boots; eye and respiratory protection mandatory
Isolation: ERG 125: Small spill isolate 100m; large spill isolate 800m initial, protect 1.6km downwind day or 3.2km night
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
• Vapors are extremely irritating and corrosive.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— 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.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1048 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1048 Hydrogen bromide, anhydrous Cls2 ERG125 | allfirefighter.com/hazmat/un/1048SMS / 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/1048
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Frequently Asked Questions about UN 1048
TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water.
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 with SCBA required; full chemical protective suit; acid-resistant gloves and boots; eye and respiratory protection mandatory
Water reactivity: Dissolves in water forming corrosive hydrobromic acid solution; exothermic reaction with heat generation. Recommended extinguishing: Non-flammable; water spray to reduce vapors, no foam needed.
ERG Guide 125 recommendation: ERG 125: Small spill isolate 100m; large spill isolate 800m initial, protect 1.6km downwind day or 3.2km night
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 125 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.