This standard is a core laboratory method for determining the flammability of plastics and non-metallic materials, applicable to solid and foam materials with an apparent density of no less than 250 kg/m³. It includes two distinct test methods: the horizontal burning test under specific conditions is used to measure the linear burning rate of materials, while the vertical burning test is employed to evaluate the self-extinguishing properties of materials. The method involves applying a standard flame and measuring and recording key parameters for assessment. To implement this standard, the core testing instrument required is the horizontal and vertical burning tester. This equipment includes components such as a Bunsen burner, a timing system, and sample clamps, enabling precise control of flame height, application angle, and duration to meet the different requirements of the two test methods.