The main function of flash point measurement is to ensure the storage, transportation and use of liquid oil, that is, below this temperature, the concentration of light components that may evaporate does not reach the threshold of explosion.
The open cup flash point refers to the results measured by the coc open flash point apparatus called the open cup flash point, usually it is used for the determination of lubricating oil and other non-volatile solid materials.
The closed cup flash point refers to the the results measured by the pmcc pensky martens closed cup apparatus, usually it is used to measure kerosene, diesel, transformer oil and other volatile liquid materials.
Remarks: for the same oil product, the result determined by open cup method is 10-30 °C higher than that by closed cup method, because the oil and gas vaporized by open cup method is dispersed at any time during the heating process of oil test, and the temperature is higher when it reaches the mixture concentration required by flash fire.
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