GB/T 8627 - 2007 Specifies the test method for combustion or analysis of smoke density of building materials. It clarifies the test principle, puts forward requirements for the performance and construction of key equipment such as smoke density test chambers, specifies the selection, preparation and Installation methods of samples, and specifies the test process, including ignition materials, measurement of luminous flux changes in different periods to calculate smoke density. The standard provides a unified testing basis for the construction industry, helps to evaluate the fire smoke hazard of building materials, ensures building fire safety, and promotes the development of building materials towards low smoke.