GB/T 13477.3-2002 for building sealing materials, the use of standard equipment to determine the method of extrusion. The standard details the specifications of special test equipment and clarifies the requirements for the preparation of sealing material samples. Under specific pressure and time conditions, the standard equipment is operated to extrude the sealing material, and the extrusion performance is determined by measurement of the extrusion amount. This method unifies the test specifications, and can accurately evaluate the extrusion difficulty of sealing materials in construction applications. It provides a key basis for mass control and construction convenience of building sealing materials, and helps to ensure the smooth development of sealing projects.