Dhritar explains the difference between open flash point and closed flash point

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Delit Beijing Technology Co., Ltd. is equipped with the A1120 open flash point tester and the A1190 closed flash point tester. So what are the differences between these two types of flash point testers? Next, we will explain the differences between open flash point and closed flash point The term “flash point” is used to determine the lowest temperature at which a volatile substance can evaporate into a flammable gas. To measure the flash point, an ignition source must be introduced to the substance and waited for the \"flash,\" the point at which it can be ignited. The methods for measuring the flash point of oils can be divided into two main categories: open flash point and closed flash point. Instruments are divided into open-cup flash point testers and closed-cup flash point testers. As the name implies, a open-cup flash point tester measures the flash point by using the open-cup method, which is carried out in a container exposed to external air. The temperature of the substance gradually increases, with the ignition source passing through its top until it reaches a level where it begins to flicker and catch fire. The flash point here will vary depending on the distance between the substance and the ignition source – specifically, the height of the source above the cup. The commonly used method for determining the open cup value is called the open cup flash point. Closed-cup flash point tester: As the name implies, the flash point is determined using the closed-cup method, which takes place within a sealed container that is not exposed to the external atmosphere. The lid is sealed and an ignition source is introduced into the container itself, allowing for conditions that are closer to those in reality (such as those found in fuel tanks). So, what is the difference between open flash point and closed flash point? Since the closed-mouth method is carried out in a sealed environment, the results are unlikely to be affected by external elements present in the laboratory. Furthermore, they usually can result in a lower flash point, as they contain heat and the material is more likely to become flammable at an earlier stage. Therefore, they are commonly used as industry standards because they can produce lower results, thereby ensuring safer operation. However, it is important to note that neither the open-cup nor the closed-cup flash point is a fundamental parameter of the substance, but rather an empirical result of testing. They will be influenced by various criteria, including the laboratory in which they work, the equipment used, and the testing methods selected.