GB/T 328.2 - 2007 focuses on the Appearance Testing of Asphalt Waterproofing Membrane. It specifies the specific process for testing the Appearance of asphalt waterproofing membranes, covering the inspection of visible defects such as holes, wounds and wrinkles on the surface of the membrane, and the Smoothness and end Smoothness of the rolled coil are also standardized. The standard details the requirements of testing tools, such as rulers, distance observed by the naked eye, etc. Through this standard, the Appearance mass of the membrane can be intuitively judged, providing a basis for its mass initial screening, and is widely used in asphalt waterproofing membrane production, storage and construction sites to ensure that the membrane Appearance used in engineering meets the requirements of use.