In general, there are two ways in which a material may be classified as a Combustible Liquid (Hazard Class 3) pursuant to the regulations of the PHMSA/USDOT; they are:

• It does not meet the definition of any other hazard class and its flash point is above 60 °C (140 °F) and below 93 °C (200 °F).

Or…

• It meets the definition of a Flammable Liquid with a flash point of ≥100˚F and ≤140˚F and the shipper elects to classify it as a Combustible Liquid.

Read more about both of these options here:  The Classification of a Flammable Liquid and a Combustible Liquid

The transportation in commerce of a Combustible Liquid presents an interesting option when determining the placards to display on a motor vehicle or rail car. (more…)