The ISO 9038:2021 standard describes a method of testing whether a liquid product maintains combustion at a specific temperature. The standard does not determine the flash point of a liquid, but rather evaluates whether it can continue to burn at a specified test temperature. Testing involves exposing a liquid to a selected temperature and inspecting whether it can continue to burn after the ignition source is removed. The method is suitable for a wide range of flammable liquids, particularly paints, varnishes and solvents. The standard modifies the test methods and reporting requirements to improve the accuracy and Reliability of testing.