DOT Hazmat Class 2: Gases
Compressed, liquefied, or dissolved gases—pressure, BLEVE potential, toxic/asphyxiation risk.
DOT Hazard Class 2 At a Glance
DOT Hazard Class 2 covers Gases. Compressed, liquefied, or dissolved gases—pressure, BLEVE potential, toxic/asphyxiation risk. Common examples include Propane, Chlorine, Ammonia, CO2 cylinders. Use this guide for placard recognition, hazards, first actions, ERG context, and related UN numbers.
Common Hazards of Class 2 Gases
- Pressure release / projectile hazards
- BLEVE potential when heated
- Toxic inhalation or asphyxiation
How to Recognize Class 2 Gases
- Cylinders, tanks, or bulk gas transport
- Frosting, hissing, vapor clouds
- Placards indicating Class 2.x
First Actions for Class 2 Gases Incidents
Initial priorities for DOT Hazmat Class 2 (Gases) incidents. These are general guidelines — always verify with shipping papers, consult the current ERG, and follow your SOP/SOG.
- Stage upwind and control ignition sources
- Isolate; evacuate threatened areas
- Cool exposed containers from safe positions (if directed)
- Request Hazmat; monitor atmosphere as per SOP
- Consult current ERG for protective actions
Critical Don'ts for Class 2 Gases
- Do not enter vapor clouds without appropriate PPE
- Do not approach heated tanks without standoff
- Do not assume vapor is visible
Common Products & Examples — Class 2 Gases
These are representative examples only. Product-specific hazards vary — always confirm via shipping papers and current ERG.
Common UN Numbers in Class 2 (Gases)
More UN numbers discoverable via the Hazmat Hub. Always consult current ERG + SOP/SOG for operations.