What is the classification for any liquid having a flashpoint below 100 degrees Fahrenheit?

The classification of any liquid having a flashpoint below 100 degrees Fahrenheit as flammable is grounded in the definition of flashpoint itself, which refers to the lowest temperature at which the vapors of a liquid can ignite in the air. Liquids with a flashpoint below this temperature are capable of producing enough vapor to form an ignitable mixture with air at relatively low temperatures, making them particularly hazardous when it comes to fire risks.

In contrast, combustible liquids have a higher flashpoint, defined typically as 100 degrees Fahrenheit or above, meaning they pose less risk under standard conditions than flammable liquids. Non-flammable liquids generally do not ignite or burn, and while volatile substances do evaporate quickly, that alone does not specify their flammability or combustibility. Thus, the designation of "flammable" is specifically applied to those liquids identified by their flashpoint below the 100-degree threshold, indicating a significant risk of ignition under typical handling and storage conditions. Understanding this classification is crucial for safety protocols in environments where these substances are used or stored.