GB/T 3855-2005 formulates the test method for the Resin content of carbon fiber reinforced plastics. The standard clarifies the test principle, specifies the requirements for instrumentation, reagent materials and sample preparation, and details the operation procedures such as burning method and extraction method, including key steps such as sample pretreatment, heating and burning (extraction), and weighing. It also specifies the calculation and precision requirements of the results to provide a unified specification for the accurate determination of Resin content of such materials, which helps to ensure product mass and performance Stability.