The GB/T 2 2459.3 - 2008 standard specifies the bonding time test method for refractory slurry. It details the equipment required for the test, the operation steps and the method of judging the results. The bonding time is a key performance indicator of refractory slurry, which affects its construction efficiency and mass. Through standardized tests, the time node when the slurry starts to harden and lose plasticity can be accurately determined. This provides a basis for construction personnel to arrange operations reasonably and production enterprises to control product performance, ensuring that the refractory slurry has a suitable operation time during the masonry process, and ensuring the overall mass and Stability of the refractory masonry.