Abstract The difference in dimension of the final ceramic products made by casting and of the casting mould depends on the properties of the body, namely on its shrinkage by drying and firing. The determination of dimensions of the patterns for the products cast into plaster moulds must be preceded by verification of the production technology, by a thorough testing of the body and by determination of changes in dimensions during drying and firing. The aim of this paper was to compare the results of laboratory and pilot-plant tests of determination of shrinkage by drying and firing of the body for stove-tiles made by casting. The final results of pilot-plant tests of shrinkage showed 0,1-0,2 % higher values than those of laboratory tests. This difference is mainly caused by the drying process.