GB/T 42665-2023 specifies the strength test method for spherical indentation of porous ceramics. The standard specifies the applicable range of porous ceramics, describes the principle of testing the strength with spherical indentation, and specifies the equipment required for the test, sample preparation, operation process, data processing and result evaluation. According to this standard, the spherical indentation strength of porous ceramics can be accurately measured, providing key performance data for mass evaluation of porous ceramic materials, applications in filtrating, catalysis and other fields, helping related industries to rationally select materials and promoting industrial development.