Comparative test data are reported for additives (available from domestic and foreign manufacturers) that are commonly used to control the rheological properties of castables. The domestic additives are shown to be effective thinners for refractory castable compositions and provide conditions for adequate water demand of castable mixes not inferior to those of foreign additives. The physicomechanical properties of refractory castables conditioned by domestic superplasticizers are likewise not inferior to foreign analogs except perhaps for the mechanical strength.