Flash point determination

This post was last edited by lijianhuai on 2011-7-6 at 14:16. Oils with a low molecular weight are tested using the closed-cup method, such as gasoline and diesel. Oils with a high molecular weight have a higher flash point; if the closed-cup method is used, the flash point value will be even higher, and it is also more difficult to measure it. Therefore, the open-cup method is used for such substances, like asphalt

Depending on the type of flash point tester used, flash points can be divided into closed-cup flash point and open-cup flash point. It should be determined according to the product quality specifications whether to measure the closed-cup flash point or the open-cup flash point for each type of oil. Generally, petroleum products with high volatility are tested for their closed-cup flash point, as when the open-cup flash point is determined, the vapor formed by heating the oil disperses into the surrounding air, resulting in a higher measured flash point. For most lubricating oils and heavy oils, due to their low volatility, the open flash point is commonly measured. The value obtained using a specified open-cup flash point tester is called the open-cup flash point, and it is commonly used to determine lubricants. The value obtained using a specified closed-cup flash point tester is called the closed-cup flash point, and it is commonly used to determine the flash points of kerosene, diesel fuel, transformer oil, etc. At the same atmospheric pressure, the open flash point of the same substance is about 15-20 degrees Celsius higher than its closed flash point

Who is right after all? ? ? ?

What was said on the third floor is correct! Residues and lubricating oils are measured for their openness. Closed-cup test for diesel and kerosene.

Reply to 2# 448610880: You’re wrong; the flash point determination for light components is carried out using the closed-cup method