HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Dibromodifluoromethane, R12B2
HMT 15 June 2026- UN / ID
- UN 1941
- Hazard class
- 9
- Packing group
- III
- ERG guide
- ERG 171
- Special provisions
- SP T11, SP TP2
- Source
- 49 CFR §172 (15 June 2026)
Dibromodifluoromethane, R12B2
Dibromodifluoromethane is a mixed halomethane. It is a colorless non-flammable liquid. Along with Halons 1211, 2402, and 1301, it is one of the most effective fire extinguishers, however, it is also very toxic. It is a class I ozone depleting substance (ODS) Wikipedia
Substance Data
Source: PubChem (HSDB, 16.12.2019)CAS-Number75-61-6 |
Flash Point— | Boiling Point— |
| Emergency Response Guide No. 171 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class9Miscellaneous hazardous materials |
(4) Identification number |
(5) Packing Group |
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(6) Labels None |
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(1) Symbols |
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| T11 | |
|---|---|
| TP2 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 155 | see 49 CFR §173.155 |
|---|---|---|
| (8B) Non-bulk | 203 | see 49 CFR §173.203 |
| (8C) Bulk | 241 | see 49 CFR §173.241 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 100 L |
|---|---|
| (9B) Cargo aircraft only | 220 L |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
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.
No compatibility information for class 9 in 49 CFR §177.848 included.
Scope & sources (important)Click to show CFR references
This check evaluates segregation per 49 CFR §177.848. Additional loading/unloading and handling requirements may still apply; see 49 CFR §177 Subpart B (Loading and Unloading):
- §177.834 - General requirements
- §177.835 - Class 1 materials
- §177.837 - Class 3 materials
- §177.838 - Class 4 (flammable solid) materials, Class 5 (oxidizing) materials, and Division 4.2 (pyroforic liquid) materials
- §177.839 - Class 8 (corrosive) materials
- §177.840 - Class 2 (gases) materials
- §177.841 - Division 6.1 and Division 2.3 materials
- §177.842 - Class 7 (radioactive) material
- §177.843 - Contamination of vehicles

