This standard specifies two laboratory test methods for assessing the combustion performance of materials used in electrical and electronic products using small-scale flames. The specimens are fixed horizontally or vertically, respectively, and then exposed to a standardized test flame with a nominal power of 50 watts. By measuring key parameters such as the linear burning rate of the specimen in the horizontal state, or the flaming combustion and afterglow (smoldering) time in the vertical state, the flame retardant grades of the materials are evaluated and compared, such as the common HB, V-0, V-1, and V-2 levels. The core instrument for implementing this method is the horizontal and vertical burning test apparatus, which integrates a precise burner, specimen holder, automatic ignition and timing system, and can control the background and lighting conditions of the test chamber to ensure the accuracy and repeatability of the tests.