Which classification of flammable liquid has a flash point below 73°F (23°C) and a boiling point below 100°F (38°C)?

The classification of flammable liquids is important for safety and handling procedures in HVAC and other industries. A liquid categorized as Class IA is defined by having a flash point below 73°F (23°C) and a boiling point below 100°F (38°C). This characteristic means that Class IA liquids are highly volatile and can produce flammable vapors at relatively low temperatures, making them particularly hazardous in environments where ignition sources might be present.

Understanding the flash point is critical for evaluating the risk of fire or explosion when these liquids are present. Additionally, with a boiling point below 100°F, these liquids can more readily evaporate into the atmosphere, increasing the likelihood of creating hazardous vapor concentrations. This classification is essential for initiating appropriate safety measures, such as using specialized storage containers and ensuring proper ventilation, to minimize risks associated with their use.

In contrast, other classes, such as Class IB and Class IC, have higher flash points or boiling points, which alters the level of risk associated with them. Class ID refers to non-flammable liquids, which do not present the same level of hazard. Therefore, Class IA is the most crucial classification to be aware of when dealing with high-risk flammable liquids.