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This allows the development of an equilibrium between the liquid and the air volume. The ignition source is directed into the cup at regular intervals with simultaneous interruption of stirring. The test concludes upon observation of a flash that spreads throughout the inside of the cup. The corresponding temperature is the liquid's flash point.
Closed cup testers normally give lower values for the flash point than open cup (typically 5–10 °C or 9–18 °F lower) and are a better approximation to the temperature at which the vapour pressure reaches the lower flammable limit. In addition to the Penskey-Martens flash point testers, other non-equilibrial testers include TAG and Abel ...
The Cleveland open-cup method is one of three main methods in chemistry for determining the flash point of a petroleum product using a Cleveland open-cup apparatus, also known as a Cleveland open-cup tester. [1] First, the test cup of the apparatus (usually brass) is filled to a certain level with a portion of the product.
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In 1996, the removable head for flash point testers was patented, thus giving the user the option to perform flash point tests with an automatic sample changer. This allows the user to accelerate the individual tests since the manual insertion, the required cooling and the manual removal of the sample container are no longer necessary.
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The Abel test is a method developed by the British chemist Frederick Abel (1827–1902) to determine the flash point of a given sample of petroleum in order to ascertain the temperature at which it could safely be stored or used.
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