☣️ UN 1788 • CLASS 8
UN 1788 — Hydrobromic acid
Placard: Corrosive. ERG Guide 154. 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 1788 Quick Details
UN 1788
Product name: Hydrobromic acid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 50m all directions; evacuate 800m downwind if large spill; protect from physical damage
Common Hazards of UN 1788
- 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.
Chemical Identity & Physical Properties
| Also known as | Hydrogen bromide solutionHBr solutionBromhydric acidHydrobromic acid solution |
| CAS Number | 10035-10-6 |
| Appearance | Colorless to light yellow fuming liquid with a pungent, irritating odor. Aqueous solution of hydrogen bromide gas, typically 47-49% concentration. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | 126C (259F) for azeotropic mixture (47.6% HBr) |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Miscible with water; generates heat upon dilution. Already an aqueous solution. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1788
Extinguishing Media
Water spray to reduce vapors; neutralize with soda ash or lime; do not use direct water stream
PPE Requirements
⚠️ Level B minimum with SCBA; acid-resistant suit, gloves, and boots; face shield; avoid all contact with liquid and vapors
Isolation & Evacuation
ERG 154: isolate spill 50m all directions; evacuate 800m downwind if large spill; protect from physical damage
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 1788 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.
- 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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📋 Copy & Share Field Card
UN 1788 — Hydrobromic acidHAZMAT RADIO NOTE — UN 1788
Product: Hydrobromic acid
Class 8 / Corrosive / ERG 154
PPE: Level B minimum with SCBA; acid-resistant suit, gloves, and boots; face shield; avoid all contact with liquid and vapors
ISOLATION: ERG 154: isolate spill 50m all directions; evacuate 800m downwind if large spill; protect from physical damage
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 1788 — Hydrobromic acid
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Colorless to light yellow fuming liquid with a pungent, irritating odor. Aqueous solution of hydrogen bromide gas, typically 47-49% concentration.
Water Reactivity: Miscible with water; generates heat upon dilution. Already an aqueous solution.
Extinguishing: Water spray to reduce vapors; neutralize with soda ash or lime; do not use direct water stream
PPE: Level B minimum with SCBA; acid-resistant suit, gloves, and boots; face shield; avoid all contact with liquid and vapors
Isolation: ERG 154: isolate spill 50m all directions; evacuate 800m downwind if large spill; protect from physical damage
— 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/1788 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1788 Hydrobromic acid Cls8 ERG154 | ERG 154: isolate spill 50m all directions; evacuate 800m downwind if large spill | allfirefighter.com/hazmat/un/1788SMS / 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/1788
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Frequently Asked Questions about UN 1788
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 B minimum with SCBA; acid-resistant suit, gloves, and boots; face shield; avoid all contact with liquid and vapors
Water reactivity: Miscible with water; generates heat upon dilution. Already an aqueous solution.. Recommended extinguishing: Water spray to reduce vapors; neutralize with soda ash or lime; do not use direct water stream.
ERG Guide 154 recommendation: ERG 154: isolate spill 50m all directions; evacuate 800m downwind if large spill; protect from physical damage
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.