This International Standard describes two procedures, A and B, using the Pensky-Martens closed cup tester, for determining the flash point of combustible liquids, liquids with suspended solids, liquids that tend to form a surface film under the test conditions and other liquids. It is applicable for liquids with a flash point above . NOTE 1 Although technically kerosines with a flash point above may be tested using this International Standard, it is standard practice to test kerosines according to ISO 13736 [8] . Similarly, unused lubricating oils are normally tested according to ISO 2592 [5] . Procedure A is used for the determination of the flash point of paints and varnishes that do not form a surface film, unused lubricating oils and other petroleum products not covered by Procedure B. Procedure B is used for the determination of the flash point of residual fuel oils, cutback bitumens, used lubricating oils, liquids that tend to form a surface film, liquids with suspensions of solids and highly viscous materials such as polymeric solutions and adhesives. NOTE 2 For the comparison of the flash points of used and unused lubricating oils, such as in a lubricant monitoring scheme, used lubricating oils may be tested using Procedure A. However, the precision data for these materials is only valid for Procedure B. This International Standard is not applicable to water-borne paints or liquids contaminated by traces of highly volatile materials. NOTE 3 Water-borne paints may be tested using ISO 3679 [6] . Liquids contaminated by traces of highly volatile materials may be tested using ISO 1523 [4] or ISO 3679. NOTE 4 Precision data is only valid for the flash point ranges given in clause 13. 40 .C 40 .C