What is defined as a liquid having a flashpoint below 100°F?

A liquid is classified as flammable if it has a flashpoint below 100°F. The flashpoint is the lowest temperature at which the liquid can form an ignitable mixture with air. This characteristic is crucial in identifying potential fire hazards, as flammable liquids can easily ignite at relatively low temperatures.

In contrast, combustible liquids have a higher flashpoint, which means they require more heat to ignite. Inert liquids do not react chemically and are typically not hazardous; corrosive liquids can damage living tissue or materials but are defined by their chemical properties rather than flashpoint. Thus, understanding the classification based on flashpoint is essential for safety and handling protocols in environments where various liquids are used.