Flammable Liquid

A flammable liquid refers to a type of hazardous material that possesses specific characteristics making it highly susceptible to ignition and combustion. Flammable liquids are classified as Class 3 dangerous goods according to the United Nations Dangerous Goods Classification, and they are a critical consideration in various industries, including manufacturing, transportation, and chemical production. 

Flammable liquids have a defined flammability range, which is the concentration of vapor in air at which they can ignite when exposed to an ignition source. This range typically spans from the lower explosive limit (LEL) to the upper explosive limit (UEL).

Flammable liquids are categorized into three classes based on their flash points (the minimum temperatures at which they emit sufficient vapor to form an ignitable mixture with air):  

• Class 3.1 liquids with a flash point below 73.4°F (23°C) that are highly flammable.  
• Class 3.2 liquids with a flash point between 73.4°F (23°C) and 140°F (60°C) that are flammable 
• Class 3.3 liquids with a flash point between 140°F (60°C) and 200.6°F (93.7°C) that are combustible but less flammable. Examples of flammable liquids are gasoline, acetone, ethanol, and diesel fuel.