HazMat Tool — substance information
Hydrobromic acid, with more than 49 percent hydrobromic acid
HMT 15 June 2026Hydrobromic acid, with more than 49 percent hydrobromic acid
Hydrobromic acid is an aqueous solution of hydrogen bromide. It is a strong acid formed by dissolving the diatomic molecule hydrogen bromide (HBr) in water. "Constant boiling" hydrobromic acid is an aqueous solution that distills at 124.3 °C (255.7 °F) and contains 47.6% HBr by mass, which is 8.77 mol/L. Hydrobromic acid is one of the strongest mineral acids known Wikipedia
Substance Data
Source: PubChem (HSDB, 04.12.2019)CAS-Number10035-10-6 |
Flash Pointn/a | Boiling Pointn/a |
| Emergency Response Guide No. 154 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard Class8Corrosive liquids |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
|
||||||||||||||
| B2 | |
|---|---|
| B15 | |
| IB2 | |
| N41 | |
| T7 | |
| TP2 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 154 | see 49 CFR §173.154 |
|---|---|---|
| (8B) Non-bulk | 202 | see 49 CFR §173.202 |
| (8C) Bulk | 242 | see 49 CFR §173.242 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | Forbidden |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class8Corrosive liquids |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
|
||||||||||||||||
| A3 | |
|---|---|
| B2 | |
| B15 | |
| IB2 | |
| N41 | |
| T7 | |
| TP2 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 154 | see 49 CFR §173.154 |
|---|---|---|
| (8B) Non-bulk | 202 | see 49 CFR §173.202 |
| (8C) Bulk | 242 | see 49 CFR §173.242 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 1 L |
|---|---|
| (9B) Cargo aircraft only | 30 L |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class8Corrosive liquids |
(4) Identification number |
(5) Packing Group |
|||||||||
(6) Labels |
|||||||||||
(7) Special Provisions (§172.102)
|
|||||||||||
| IB3 | |
|---|---|
| T4 | |
| TP1 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 154 | see 49 CFR §173.154 |
|---|---|---|
| (8B) Non-bulk | 203 | see 49 CFR §173.203 |
| (8C) Bulk | 241 | see 49 CFR §173.241 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | Forbidden |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class8Corrosive liquids |
(4) Identification number |
(5) Packing Group |
|||||||||
(6) Labels |
|||||||||||
(7) Special Provisions (§172.102)
|
|||||||||||
| A3 | |
|---|---|
| IB3 | |
| T4 | |
| TP1 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 154 | see 49 CFR §173.154 |
|---|---|---|
| (8B) Non-bulk | 203 | see 49 CFR §173.203 |
| (8C) Bulk | 241 | see 49 CFR §173.241 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 5 L |
|---|---|
| (9B) Cargo aircraft only | 60 L |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
Packing group comparison
Multiple packing groups apply to this entry. See assignment criteria in 49 CFR §173 Subpart D. Details are in the tabs above; differences are highlighted.
| PG II | PG II | PG III | PG III | |
|---|---|---|---|---|
| 1 | ||||
| 2 | Hydrobromic acid, with more than 49 percent hydrobromic acid | Hydrobromic acid, with not more than 49 percent hydrobromic acid | Hydrobromic acid, with more than 49 percent hydrobromic acid | Hydrobromic acid, with not more than 49 percent hydrobromic acid |
| 3 | 8 | 8 | 8 | 8 |
| 4 | UN 1788 | UN 1788 | UN 1788 | UN 1788 |
| 5 | II | II | III | III |
| 6 | 8 | 8 | 8 | 8 |
| 7 | B2, B15, IB2, N41, T7, TP2 | A3, B2, B15, IB2, N41, T7, TP2 | IB3, T4, TP1 | A3, IB3, T4, TP1 |
| 8A | 154 | 154 | 154 | 154 |
| 8B | 202 | 202 | 203 | 203 |
| 8C | 242 | 242 | 241 | 241 |
| 9A | Forbidden | 1 L | Forbidden | 5 L |
| 9B | Forbidden | 30 L | Forbidden | 60 L |
| 10A | C | C | C | C |
| 10B | 53, 58 | 53, 58 | 8, 53, 58 | 8, 53, 58 |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
Note: In this segregation and separation chart are HazMat of hazard class 8 considered depending if there are liquid. Currently HazMat Tool is not able to to check if a HazMat is liquid or not. Therefore it is assumed as liquid. See PHMSA Interpretation #09-0252.
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
|---|---|---|
| UN 1788 | Hydrobromic acid, with more than 49 percent hydrobromic acid | 8 |


