GB/T 2576-2005 specifies the test method for the insoluble content of fiber-reinforced plastics Resin. The standard specifies the test principle, required equipment and reagents, standardizes the preparation and test steps of the sample, and describes the extraction, drying and weighing process of Resin insoluble content in detail. At the same time, the calculation method and precision requirements of the results are given. It provides a unified technical basis for the accurate determination of the insoluble content of fiber-reinforced plastics Resin, and helps to control the mass and performance of the product.