This part specifies the methods and requirements for the flexural strength test of synthetic Stone. Includes the terms and definitions of the test, principles, required instrumentation and equipment, specimen preparation, specific test steps, test results and the content of the test report. The standard cites GB/T 35165 "Terms and Classification of Synthetic Stone" as the basis for terms and definitions, ensuring uniform understanding and application in the test process. Measurement of the flexural strength of the specimen by applying a gradually increasing load to the fracture of the specimen to evaluate the performance of synthetic Stone under stressed conditions.