The difference between closed flash point tester and open flash point tester

The difference between closed flash point tester and open flash point tester

As we all know, the flash point is the lowest temperature at which a flammable liquid or solid can release sufficient vapour to form a flammable mixture with the air on the surface of the liquid or solid in the container being used. When the concentration of oil surface vapor and air mixture increases, encountering an open flame can form a low-temperature ignition point for continuous combustion (duration of not less than 5 seconds).

Closed flash point tester is a new type of instrument for measuring the closed flash point of petroleum products. The closed-cup flash point tester uses the closed-cup method to measure the flash point of dangerous goods and flammable liquids. It is suitable for flash point testing of flammable liquids, liquid mixtures and liquids containing solid substances, but not for liquids that are classified in other categories because of their hazardous properties. The flash point of the closed cup test is equal to or lower than 60°C.

So, what is the difference between a closed flash point temperature tester and an open flash point tester?

What is an open flash point tester? In fact, the open flash point tester is mainly used for lubricating oil and heavy oil products. The measured flash point is on the high side because the vapor formed by heating the petroleum product diffuses continuously into the surrounding air when the open flash point is measured. For most lubricating and heavy oils, especially when used in non-sealed parts or in low temperature conditions, even with a certain amount of light mixture, they will evaporate during use without creating a fire hazard, therefore, such products It is measured with an open flash point tester.

In addition, in some lubricating oil specifications, there are two quality indicators, open and closed. The purpose was to examine the breadth and presence of light components in lubricating oil fractions by the difference between open and closed flash points. Some lubricating oils are used in airtight containers, and high temperature is often caused by various reasons (such as high speed or other reasons causing equipment overheating, current interruption, arc effect, etc.), so that the lubricating oil may form decomposition products, or from other Partially blend light ingredients. Therefore, it is necessary to use a closed flash point tester.

HZBS-X3 Closed Cup Flashpoint Measuring Instrument    

HZKS-3 Open Cup Flash Point Tester