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Objective is to establish how the layers drying regime and the composition of refractory slurry when using coarse dusting quartz sand as the cushioning layer influence the strength of not pre-calcinate and calcinate liquid glass ceramic shell mold. The original methodology, standard and generally accepted research methods including a methodology to determine the relative viscosity of suspension, mass, time, temperature, relative humidity and air velocity were used in the work. The results of studies of the effect on the strength of liquid glass ceramic shell mold of various conditions of its production are shown. The greatest strength of the liquid glass ceramic shell mold acquires when duration of drying of the 2nd ... 4th layer in an air stream with a temperature of 33 ... 34 °C, speed 2.2 ... 2.5 m/s for not less than 3 hours using water glass with a specific gravity of 1.28 ... 1.29g/cm³ and a specific viscosity of liquid glass slurry of 31 ... 32 s. The data obtained allow us promptly decide on the necessary adjustment of the composition of the refractory slurry under conditions of a cast shop (Fig. 4., Table 6). [ABSTRACT FROM AUTHOR]