Analysis of Distribution of Properties of Expanded Polystyrene in Production and Their Changes in Exploitation Conditions

The paper presents the properties of expanded polystyrene slabs manufactured by different manufacturers. The research on the effect of moisture impact on the value of thermal conductivity coefficient of expanded polystyrene products has been carried out too. The limits for application of results of research have been determined, taking into account the distribution of properties of different expanded polystyrene products produced by different manufacturers. The research results show that the thermal conductivity coefficient of EPS conditioned in 80 % relative air humidity environment rises by approximately 0.001 W/(mu.K), and for EPS conditioned in 97 % relative air humidity conditions-by 0.002 W/(mu.K), in comparison with the average declared values of the thermal conductivity coefficient.