This standard specifies the classification, technical requirements, test methods, mass assessment procedures, Encasement, marking, transportation, storage and mass certificate of clay refractory slurry. Clay refractory slurry suitable for laying clay refractory bricks. According to its physical and chemical properties, it is divided into different grades such as NN-30, NN-38, NN-42, NN-45, NN-45P, etc., where "N" and "N" represent the initials of clay and mud respectively, followed by numbers indicating the mass fraction of the main components, and "P" indicates phosphoric acid salt combined with refractory slurry.