UN 1145Cyclohexane
Class 3
Flammable liquids
Summary
UN 1145 is the UN number for cyclohexane. It is classed in Class 3 (flammable liquids) for transport. Packing group II. Emergency responders use ERG guide 128.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide128Cyclohexane
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 1145
- Name
- Cyclohexane
- Hazard class
- Class 3: Flammable liquids
- Packing group
- II
- What the class covers
- Flammable liquids (and, in the U.S., combustible liquids).
U.S. Hazardous Materials Table
The entry for this number in 49 CFR 172.101.
UN1145Cyclohexane
Special provisions: IB2, T4, TP1
- Class
- 3
- Packing group
- II
- Labels
- 3
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 3
Class 3 covers flammable liquids such as gasoline, diesel, solvents, paints and alcohols. In the United States, some liquids with higher flash points can also be shipped as combustible liquids under the same class.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 1145NOAA 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