7.11.1 EHS Modified DOT Hazard Class System
The basic DOT hazard classes and hazard class numbers are:
|DOT Hazard Class Number||Hazard Class|
|Class 2||Compressed gases|
|Class 3||Flammable liquids|
|Class 4||Flammable solids|
|Class 7||Radioactive materials|
|Class 9||Store with Class 6|
The DOT hazard class numbers can be found on hazard class labels, in SDSs (under the “Transportation Information Section”), on container labels, and in other reference texts. An explanation of the DOT Hazard Class system can be found in the DOT Training Modules and an expanded version of the DOT hazard classes can be found on the EHS Signs and Labels webpage.
The EHS chemical segregation scheme modifies the DOT system by breaking down hazard classes into subcategories. A handout on the EHS Chemical Segregation Scheme can be found in the appendix.