The GB/T 2 2459.4 - 2008 standard specifies the test method for the flexural bond strength of refractory slurry at room temperature. The method details the test equipment, sample preparation, loading process and result calculation. The flexural bond strength at room temperature is related to the bonding firmness of refractory slurry to refractory materials at room temperature, which affects the Stability of masonry structure. Through this standard, production enterprises and testing institutions can accurately determine the performance index, and then control the product mass. Ensure that refractory slurry can provide reliable bonding force at the initial stage in the masonry of high-temperature facilities such as industrial kilns, laying a good foundation for subsequent high-temperature use.