UN 1788Hydrobromic acid, with more than 49 percent hydrobromic acid or Hydrobromic acid, with not more than 49 percent hydrobromic acid
Class 8
Corrosives
Summary
UN 1788 is the UN number for hydrobromic acid, with more than 49 percent hydrobromic acid or Hydrobromic acid, with not more than 49 percent hydrobromic acid. It is classed in Class 8 (corrosives) for transport. Packing group II or III, depending on the form. Emergency responders use ERG guide 154.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide154Hydrobromic acid
From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.
Identification
- UN number
- UN 1788
- Name
- Hydrobromic acid, with more than 49 percent hydrobromic acid or Hydrobromic acid, with not more than 49 percent hydrobromic acid
- Hazard class
- Class 8: Corrosives
- Packing group
- II, III
- What the class covers
- Substances which can damage living tissue or other goods and materials on contact.
U.S. Hazardous Materials Table
4 entries share this number in 49 CFR 172.101, by name, packing group or where the shipment is going.
UN1788Hydrobromic acid
with more than 49 percent hydrobromic acid
Special provisions: B2, B15, IB2, N41, T7, TP2
- Class
- 8
- Packing group
- II
- Labels
- 8
UN1788Hydrobromic acid
with more than 49 percent hydrobromic acid
Special provisions: IB3, T4, TP1
- Class
- 8
- Packing group
- III
- Labels
- 8
UN1788Hydrobromic acid
with not more than 49 percent hydrobromic acid
Special provisions: A3, B2, B15, IB2, N41, T7, TP2
- Class
- 8
- Packing group
- II
- Labels
- 8
UN1788Hydrobromic acid
with not more than 49 percent hydrobromic acid
Special provisions: A3, IB3, T4, TP1
- Class
- 8
- Packing group
- III
- Labels
- 8
From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.
About Class 8
Class 8 covers corrosive substances such as acids, alkalis and battery fluid, which can destroy skin or corrode metal on contact.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 1788NOAA datasheets with the ERG response guide and isolation distances
- Emergency Response Guidebook (ERG)PHMSA's guide for first responders, free as a PDF or app
- 49 CFR 172.101 Hazardous Materials TableThe legal U.S. entry: proper shipping name, packing group, labels and special provisions