GB/T 5169.12-2024 is Part 12 of the series of standards on fire hazard testing for electrical and electronic products. It specifies the test method for the Glow-Wire Flammability Index (GWFI) of materials and applies to solid insulating materials and other solid materials used in electrical and electronic products. The core purpose is to evaluate the material's ability to resist ignition and sustained combustion under high-temperature conditions. The standard simulates fault-induced high-temperature scenarios using a nickel-chromium glow-wire, determining the maximum temperature at which the material either does not ignite or extinguishes within 30 seconds after ignition, with any drips failing to ignite tissue paper. The test requires standardized glow-wire test apparatus, a high-precision temperature measurement system, accurate timing equipment, a specimen mounting fixture, and a dedicated test chamber. Strict control of contact parameters and environmental conditions is essential, providing a unified technical basis for material selection and safety quality control in product applications.