Abstract: In the production process, resin content has an important influence on the performance of glass fiber prepreg and the resin content of the prepreg measured by different test methods will also vary. In this study, four batches of high silica/phenolic plastics prepregs were tested by dissolution method and burning method. The Dixon criterion was used to eliminate the outliers and the uncertainty was evaluated for each set of data. The test results show that the value of resin content determined by dissolution method is lower, which may be caused by incomplete elution of the dissolved resin, and the uncertainty of resin content determined by burning method is smaller, which shows that test result of the burning method is more stable. In order to make the test results more accurate, burning method should be chosen.

Key words: prepreg, resin content, test, uncertainty