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In the method of full mould the polystyrene model, which fills the mould cavity in the course of filling by the liquid metal is subjected tothe influence of high temperature and passes from the solid, through the liquid, to the gaseous state. During this process solid and gaseousproducts of thermal decomposition of polystyrene patterns occur. The kinetics of this process is significantly influenced by the gasificationtemperature, density and mass of the polystyrene patterns. One of the basic parameters is the amount and rate of gas from the polystyrenemodel during its thermal decomposition. Specific properties of ceramic layer used for lost foam castings are required. To ensure optimalprocess flow of metal in the form proper permeability of the ceramic layer is needed.To ensure optimal conditions for technological casting method EPS patterns are tested and determined are the technological parametersand physical-chemical process in: material properties of the pattern, properties of the ceramic layer applied to the pattern, pattern gasification kinetics pouring processIn the course of the research the characteristics of polystyrene and ceramic layer were determined.