ASTM D3934-1990 (2007) Standard Test Method for the Determination of Flash Point/No Flash Point Test by Equilibrate Closed Cup Method provides a standardized method for the determination of flash point and no flash point of liquids or low viscosity substances by equilibrate closed cup instruments. This method is suitable for samples with flash points in the range of -30 ° C to 300 ° C, including flammable liquids and Miscellaneous volatile matter. The standard details test equipment, sample preparation, test conditions, operating procedures, and data recording requirements, with emphasis on safety during the test and repeatability of results. This method is widely used in Petrochemicals, Coatings, solvents and Miscellaneous chemical industries, providing a reliable basis for fire risk assessment and transportation and storage safety of substances, and providing technical support for quality control and regulatory compliance.