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The thickness of the desublimatd solid layer is an important parameter required forevaluation of such desublimation process, especially in the case of solid layers productionneeded for special applications. A mathematical model has been derived based on theanalogy of heat and mass transfer to calculate the solid layer thickness of the desublimatedlayer during the operation period. The prediction of thickness from the derived model isbased on the data related to the applied experimental conditions as well as the physicalproperties of the vapour-gas mixture inside desublimator. The calculated thickness from themodel has been used to calculate the temperature gradient of the solid layer surface duringthe run period.