Many national and international regulations classify liquids as presenting a flammable hazard on the basis of their flash point, as determined by a recognised method. Some of these regulations allow a derogation if the substance cannot "sustain combustion" at some specified temperature or temperatures. This International Standard specifies a pass/fail procedure to determine whether or not a liquid product, that would be classified as "flammable" by virtue of its flash point, has the ability to sustain combustion at the temperature or temperatures specified in the appropriate regulations.