The standard "SY/T 5645-1993 (1998) Technical conditions for the flash point and ignition point tester of petroleum products (Cleveland open cup method) " specifies the technical conditions for the tester for the determination of the flash point and ignition point of petroleum products using the Cleveland open cup method. The standard is applicable to the testing of various petroleum products, including liquid fuels and lubricating oils. The standard describes the technical requirements of the tester in detail, including instrument structure, operation requirements, measurement range and accuracy, etc. The implementation of this standard can ensure the accuracy and reliability of the tester in the determination of the flash point and ignition point of petroleum products, providing necessary technical support for the production and mass inspection of the petroleum industry.