GB/T 20309 - 2006 is used to determine the mouldability of fiberglass felt and fabric. The standard specifies the applicable product range of fiberglass felt and fabric, specifies the sample collection and preparation methods, and specifies the requirements of molds, pressure equipment and other instruments required for testing. Standardize the measurement operation process, including key links such as pressure application method and time control, as well as the evaluation and reporting form of the results. The mouldability is related to the product molding effect and mass. This standard provides a unified method for the production and testing of fiberglass products, helps enterprises control the product mass, and promotes the industry standardization process.