This standard specifies a test method for determining the vertical burning characteristics of soft, thin plastic specimens, such as films, typically with a thickness not exceeding 0.1 mm. The principle involves securing the specimen in the form of a vertical cylinder and exposing it to a specified small test flame. The relative flame resistance of the material is compared by measuring the after-flame and afterglow times following two flame applications. This method is primarily intended as a laboratory screening procedure for quality control or material preselection, particularly suitable for evaluating materials that tend to curl or shrink when exposed to fire and cannot be tested by conventional methods. The core specialized equipment for conducting this test is the plastic vertical burning tester (or a laboratory fume hood/test chamber with equivalent functionality), which integrates a compliant laboratory burner (ignition source), specimen holder, timer, and safety exhaust system to ensure the test is performed under controlled conditions.