GB/T42667-2023 provides the double-ring method test specification for the biaxial flexural strength of fine ceramics at room temperature. It clarifies the applicable types of fine ceramics, explains the principle of double-ring method to test the strength in detail, and stipulates the test equipment, sample preparation, operation process, data processing and other links. According to this standard, the equal biaxial flexural strength of fine ceramics can be accurately measured at room temperature, providing key strength data for mass control, applications in aerospace, electronics and other fields, helping the industry to screen high-quality materials, and promoting the development of the fine ceramics industry.