What is the flash point of petroleum products?

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The flash point is a physical property value used to assess the tendency of flammable materials to catch fire, while the ignition point is another physical property value used to determine the temperature at which such materials ignite. Both are expressed in degrees Celsius (°C), and they are quite similar to each other; generally, the ignition point is about 5°C higher than the flash point. For highly flammable substances, the difference is even smaller. Previously, the ignition point was often used to assess the danger of flammable materials; nowadays, the flash point is the indicator that is more commonly used. From a fire safety perspective, the flash point represents the lowest temperature at which a flammable material can be ignited, and the lower the flash point, the greater the risk. Flash point: A flammable liquid can evaporate to form vapors that enter the air. As the temperature rises, evaporation accelerates. When a mixture of volatile vapor and air comes into contact with a heat source and sparks are generated, this brief combustion process is called flash ignition, and the lowest temperature at which flash ignition occurs is known as the flash point. From a fire safety perspective, the flash point of a liquid is the lowest temperature at which it can cause a fire. The lower the flash point, the greater the risk of fire. There are two methods for determining flash point: the open cup method and the closed cup method. The open-cup method involves placing the oil sample in an open container and heating it for measurement. The closed-cup method involves heating an oil sample in a covered container for measurement. For the same oil, different testing methods yield different values; generally, the open flash point is 15~25°C higher than the closed flash point.